2468 lines
63 KiB
HTML
2468 lines
63 KiB
HTML
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<!doctype html>
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<html lang="en" class="no-js">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link rel="canonical" href="https://linkedin.github.io/school-of-sre/level101/git/git-basics/">
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<link rel="shortcut icon" href="../../../img/favicon.ico">
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<meta name="generator" content="mkdocs-1.1.2, mkdocs-material-6.2.8">
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<title>Git Basics - School Of SRE</title>
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<link rel="stylesheet" href="../../../assets/stylesheets/main.cb6bc1d0.min.css">
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<link rel="stylesheet" href="../../../assets/stylesheets/palette.39b8e14a.min.css">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700%7CRoboto+Mono&display=fallback">
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<style>body,input{font-family:"Roboto",-apple-system,BlinkMacSystemFont,Helvetica,Arial,sans-serif}code,kbd,pre{font-family:"Roboto Mono",SFMono-Regular,Consolas,Menlo,monospace}</style>
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<link rel="stylesheet" href="../../../stylesheets/custom.css">
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</head>
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<body dir="ltr" data-md-color-scheme="" data-md-color-primary="none" data-md-color-accent="none">
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<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
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<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
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<label class="md-overlay" for="__drawer"></label>
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<div data-md-component="skip">
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<a href="#git" class="md-skip">
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Skip to content
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</a>
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</div>
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<div data-md-component="announce">
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</div>
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<script async defer data-domain="linkedin.github.io" src="https://tracking.eskratch.com/js/plausible.js"></script>
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<script>document.addEventListener("DOMContentLoaded", function() {
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document.getElementById("nav-3").checked=true;
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}
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});</script>
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<header class="md-header" data-md-component="header">
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<nav class="md-header-nav md-grid" aria-label="Header">
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<a href="https://linkedin.github.io/school-of-sre/" title="School Of SRE" class="md-header-nav__button md-logo" aria-label="School Of SRE">
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<img src="../../../img/sos.png" alt="logo">
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</a>
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<!-- Button to open drawer -->
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<label class="md-header-nav__button md-icon" for="__drawer">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2z"/></svg>
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</label>
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<div class="md-header-nav__title" data-md-component="header-title">
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<div class="md-header-nav__ellipsis">
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<span class="md-header-nav__topic md-ellipsis">
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<a href="https://linkedin.github.io/school-of-sre/" title="School Of SRE" >
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School Of SRE
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</a>
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</span>
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<span class="md-header-nav__topic md-ellipsis">
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Git Basics
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</span>
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</div>
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</div>
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<label class="md-header-nav__button md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0116 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 019.5 16 6.5 6.5 0 013 9.5 6.5 6.5 0 019.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5z"/></svg>
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</label>
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<div class="md-search" data-md-component="search" role="dialog">
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" data-md-state="active" required>
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<label class="md-search__icon md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0116 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 019.5 16 6.5 6.5 0 013 9.5 6.5 6.5 0 019.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5z"/></svg>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg>
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</label>
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<button type="reset" class="md-search__icon md-icon" aria-label="Clear" data-md-component="search-reset" tabindex="-1">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41z"/></svg>
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</button>
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</form>
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<div class="md-search__output">
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<div class="md-search__scrollwrap" data-md-scrollfix>
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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</div>
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<ol class="md-search-result__list"></ol>
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</div>
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</div>
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</div>
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</div>
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</div>
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</nav>
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</header>
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<div class="md-container" data-md-component="container">
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<div class="md-sidebar md-sidebar--primary" data-md-component="navigation" >
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<div class="md-sidebar__scrollwrap">
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../.." class="md-nav__link">
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Home
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2" type="checkbox" id="nav-2" checked>
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<label class="md-nav__link" for="nav-2">
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Level 101
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Level 101" data-md-level="1">
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<label class="md-nav__title" for="nav-2">
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<span class="md-nav__icon md-icon"></span>
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Level 101
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item md-nav__item--active md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" checked>
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<label class="md-nav__link" for="nav-2-1">
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Fundamentals Series
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Fundamentals Series" data-md-level="2">
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<label class="md-nav__title" for="nav-2-1">
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<span class="md-nav__icon md-icon"></span>
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Fundamentals Series
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1-1" type="checkbox" id="nav-2-1-1" >
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<label class="md-nav__link" for="nav-2-1-1">
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Linux Basics
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Linux Basics" data-md-level="3">
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<label class="md-nav__title" for="nav-2-1-1">
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<span class="md-nav__icon md-icon"></span>
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Linux Basics
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../linux_basics/intro/" class="md-nav__link">
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Introduction
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../linux_basics/command_line_basics/" class="md-nav__link">
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Command Line Basics
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
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Server Administration
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../linux_basics/conclusion/" class="md-nav__link">
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Conclusion
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item md-nav__item--active md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1-2" type="checkbox" id="nav-2-1-2" checked>
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<label class="md-nav__link" for="nav-2-1-2">
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Git
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Git" data-md-level="3">
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<label class="md-nav__title" for="nav-2-1-2">
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<span class="md-nav__icon md-icon"></span>
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Git
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc">
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<label class="md-nav__link md-nav__link--active" for="__toc">
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Git Basics
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<span class="md-nav__icon md-icon"></span>
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</label>
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<a href="./" class="md-nav__link md-nav__link--active">
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Git Basics
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</a>
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<label class="md-nav__title" for="__toc">
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<span class="md-nav__icon md-icon"></span>
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Table of contents
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#prerequisites" class="md-nav__link">
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Prerequisites
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#what-to-expect-from-this-course" class="md-nav__link">
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What to expect from this course
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#what-is-not-covered-under-this-course" class="md-nav__link">
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What is not covered under this course
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#course-contents" class="md-nav__link">
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Course Contents
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#git-basics" class="md-nav__link">
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Git Basics
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</a>
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<nav class="md-nav" aria-label="Git Basics">
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<ul class="md-nav__list">
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<li class="md-nav__item">
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<a href="#creating-a-git-repo" class="md-nav__link">
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Creating a Git Repo
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#tracking-a-file" class="md-nav__link">
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Tracking a File
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#more-about-a-commit" class="md-nav__link">
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More About a Commit
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#adding-more-changes" class="md-nav__link">
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Adding More Changes
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#are-commits-really-linked" class="md-nav__link">
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Are commits really linked?
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#the-version-control-part-of-git" class="md-nav__link">
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The Version Control part of Git
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#reference" class="md-nav__link">
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Reference
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#references-and-the-magic" class="md-nav__link">
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References and The Magic
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#little-adventure" class="md-nav__link">
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Little Adventure
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</a>
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</li>
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</ul>
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</nav>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item">
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<a href="../branches/" class="md-nav__link">
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Working With Branches
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../github-hooks/" class="md-nav__link">
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Github and Hooks
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../conclusion/" class="md-nav__link">
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Conclusion
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1-3" type="checkbox" id="nav-2-1-3" >
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<label class="md-nav__link" for="nav-2-1-3">
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Linux Networking
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Linux Networking" data-md-level="3">
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<label class="md-nav__title" for="nav-2-1-3">
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<span class="md-nav__icon md-icon"></span>
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Linux Networking
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../linux_networking/intro/" class="md-nav__link">
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Introduction
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../linux_networking/dns/" class="md-nav__link">
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DNS
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../linux_networking/udp/" class="md-nav__link">
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UDP
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../linux_networking/http/" class="md-nav__link">
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HTTP
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../../linux_networking/tcp/" class="md-nav__link">
|
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TCP
|
|
</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="../../linux_networking/ipr/" class="md-nav__link">
|
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Routing
|
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</a>
|
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</li>
|
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<li class="md-nav__item">
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<a href="../../linux_networking/conclusion/" class="md-nav__link">
|
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Conclusion
|
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</a>
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</li>
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</ul>
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</nav>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
|
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<label class="md-nav__link" for="nav-2-2">
|
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Python and Web
|
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<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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<nav class="md-nav" aria-label="Python and Web" data-md-level="2">
|
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<label class="md-nav__title" for="nav-2-2">
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<span class="md-nav__icon md-icon"></span>
|
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Python and Web
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../python_web/intro/" class="md-nav__link">
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Introduction
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../../python_web/python-concepts/" class="md-nav__link">
|
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Some Python Concepts
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../../python_web/python-web-flask/" class="md-nav__link">
|
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Python, Web and Flask
|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="../../python_web/url-shorten-app/" class="md-nav__link">
|
|
The URL Shortening App
|
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</a>
|
|
</li>
|
|
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<li class="md-nav__item">
|
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<a href="../../python_web/sre-conclusion/" class="md-nav__link">
|
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Conclusion
|
|
</a>
|
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</li>
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|
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</ul>
|
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</nav>
|
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
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<label class="md-nav__link" for="nav-2-3">
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Data
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Data" data-md-level="2">
|
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<label class="md-nav__title" for="nav-2-3">
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<span class="md-nav__icon md-icon"></span>
|
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Data
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3-1" type="checkbox" id="nav-2-3-1" >
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<label class="md-nav__link" for="nav-2-3-1">
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Relational Databases
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Relational Databases" data-md-level="3">
|
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<label class="md-nav__title" for="nav-2-3-1">
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<span class="md-nav__icon md-icon"></span>
|
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Relational Databases
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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|
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<li class="md-nav__item">
|
|
<a href="../../databases_sql/intro/" class="md-nav__link">
|
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Introduction
|
|
</a>
|
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</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../../databases_sql/concepts/" class="md-nav__link">
|
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Key Concepts
|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="../../databases_sql/mysql/" class="md-nav__link">
|
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MySQL
|
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</a>
|
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</li>
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|
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<li class="md-nav__item">
|
|
<a href="../../databases_sql/innodb/" class="md-nav__link">
|
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InnoDB
|
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</a>
|
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</li>
|
|
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../../databases_sql/backup_recovery/" class="md-nav__link">
|
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Backup and Recovery
|
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</a>
|
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</li>
|
|
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../../databases_sql/replication/" class="md-nav__link">
|
|
MySQL Replication
|
|
</a>
|
|
</li>
|
|
|
|
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|
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3-1-7" type="checkbox" id="nav-2-3-1-7" >
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<label class="md-nav__link" for="nav-2-3-1-7">
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Operational Concepts
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<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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<nav class="md-nav" aria-label="Operational Concepts" data-md-level="4">
|
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<label class="md-nav__title" for="nav-2-3-1-7">
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<span class="md-nav__icon md-icon"></span>
|
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Operational Concepts
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
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|
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<li class="md-nav__item">
|
|
<a href="../../databases_sql/select_query/" class="md-nav__link">
|
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Select Query
|
|
</a>
|
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</li>
|
|
|
|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../../databases_sql/query_performance/" class="md-nav__link">
|
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Query Performance
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
</li>
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../databases_sql/lab/" class="md-nav__link">
|
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Lab
|
|
</a>
|
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</li>
|
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|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../databases_sql/conclusion/" class="md-nav__link">
|
|
Conclusion
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3-2" type="checkbox" id="nav-2-3-2" >
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<label class="md-nav__link" for="nav-2-3-2">
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NoSQL
|
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<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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<nav class="md-nav" aria-label="NoSQL" data-md-level="3">
|
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<label class="md-nav__title" for="nav-2-3-2">
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<span class="md-nav__icon md-icon"></span>
|
|
NoSQL
|
|
</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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|
<li class="md-nav__item">
|
|
<a href="../../databases_nosql/intro/" class="md-nav__link">
|
|
Introduction
|
|
</a>
|
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</li>
|
|
|
|
|
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../../databases_nosql/key_concepts/" class="md-nav__link">
|
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Key Concepts
|
|
</a>
|
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</li>
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|
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../../databases_nosql/further_reading/" class="md-nav__link">
|
|
Conclusion
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
</li>
|
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3-3" type="checkbox" id="nav-2-3-3" >
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<label class="md-nav__link" for="nav-2-3-3">
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Big Data
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<span class="md-nav__icon md-icon"></span>
|
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</label>
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<nav class="md-nav" aria-label="Big Data" data-md-level="3">
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<label class="md-nav__title" for="nav-2-3-3">
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<span class="md-nav__icon md-icon"></span>
|
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Big Data
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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<li class="md-nav__item">
|
|
<a href="../../big_data/intro/" class="md-nav__link">
|
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Introduction
|
|
</a>
|
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</li>
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../../big_data/evolution/" class="md-nav__link">
|
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Evolution and Architecture of Hadoop
|
|
</a>
|
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</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../../big_data/tasks/" class="md-nav__link">
|
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Conclusion
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|
</a>
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</li>
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|
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|
|
</ul>
|
|
</nav>
|
|
</li>
|
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|
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</ul>
|
|
</nav>
|
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-4" type="checkbox" id="nav-2-4" >
|
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<label class="md-nav__link" for="nav-2-4">
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Systems Design
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<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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<nav class="md-nav" aria-label="Systems Design" data-md-level="2">
|
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<label class="md-nav__title" for="nav-2-4">
|
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<span class="md-nav__icon md-icon"></span>
|
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Systems Design
|
|
</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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|
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<li class="md-nav__item">
|
|
<a href="../../systems_design/intro/" class="md-nav__link">
|
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Introduction
|
|
</a>
|
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</li>
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|
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<li class="md-nav__item">
|
|
<a href="../../systems_design/scalability/" class="md-nav__link">
|
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Scalability
|
|
</a>
|
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|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../systems_design/availability/" class="md-nav__link">
|
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Availability
|
|
</a>
|
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</li>
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../systems_design/fault-tolerance/" class="md-nav__link">
|
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Fault Tolerance
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../systems_design/conclusion/" class="md-nav__link">
|
|
Conclusion
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-5" type="checkbox" id="nav-2-5" >
|
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<label class="md-nav__link" for="nav-2-5">
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Metrics and Monitoring
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<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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<nav class="md-nav" aria-label="Metrics and Monitoring" data-md-level="2">
|
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<label class="md-nav__title" for="nav-2-5">
|
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<span class="md-nav__icon md-icon"></span>
|
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Metrics and Monitoring
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
|
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|
|
|
|
|
|
|
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|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../metrics_and_monitoring/introduction/" class="md-nav__link">
|
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Introduction
|
|
</a>
|
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</li>
|
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|
|
|
|
|
|
|
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|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../metrics_and_monitoring/command-line_tools/" class="md-nav__link">
|
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Command-line Tools
|
|
</a>
|
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</li>
|
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|
|
|
|
|
|
|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../metrics_and_monitoring/third-party_monitoring/" class="md-nav__link">
|
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Third-party Monitoring
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
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|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../metrics_and_monitoring/alerts/" class="md-nav__link">
|
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Proactive Monitoring with Alerts
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
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|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../metrics_and_monitoring/best_practices/" class="md-nav__link">
|
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Best Practices for Monitoring
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../metrics_and_monitoring/observability/" class="md-nav__link">
|
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Observability
|
|
</a>
|
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</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../metrics_and_monitoring/conclusion/" class="md-nav__link">
|
|
Conclusion
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
</li>
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<li class="md-nav__item md-nav__item--nested">
|
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<input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-6" type="checkbox" id="nav-2-6" >
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<label class="md-nav__link" for="nav-2-6">
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Security
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Security" data-md-level="2">
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<label class="md-nav__title" for="nav-2-6">
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<span class="md-nav__icon md-icon"></span>
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Security
|
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
|
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|
<li class="md-nav__item">
|
|
<a href="../../security/intro/" class="md-nav__link">
|
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Introduction
|
|
</a>
|
|
</li>
|
|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../../security/fundamentals/" class="md-nav__link">
|
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Fundamentals of Security
|
|
</a>
|
|
</li>
|
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<a href="../../../CODE_OF_CONDUCT/" class="md-nav__link">
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Code of Conduct
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</a>
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<li class="md-nav__item">
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<a href="../../../sre_community/" class="md-nav__link">
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SRE Community
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</a>
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</li>
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</ul>
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</nav>
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<div class="md-sidebar md-sidebar--secondary" data-md-component="toc" >
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<span class="md-nav__icon md-icon"></span>
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Table of contents
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</label>
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<li class="md-nav__item">
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<a href="#prerequisites" class="md-nav__link">
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Prerequisites
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#what-to-expect-from-this-course" class="md-nav__link">
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What to expect from this course
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#what-is-not-covered-under-this-course" class="md-nav__link">
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What is not covered under this course
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#course-contents" class="md-nav__link">
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Course Contents
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#git-basics" class="md-nav__link">
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Git Basics
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</a>
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<nav class="md-nav" aria-label="Git Basics">
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<ul class="md-nav__list">
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<li class="md-nav__item">
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<a href="#creating-a-git-repo" class="md-nav__link">
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Creating a Git Repo
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#tracking-a-file" class="md-nav__link">
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Tracking a File
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#more-about-a-commit" class="md-nav__link">
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More About a Commit
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#adding-more-changes" class="md-nav__link">
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Adding More Changes
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#are-commits-really-linked" class="md-nav__link">
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Are commits really linked?
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#the-version-control-part-of-git" class="md-nav__link">
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The Version Control part of Git
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#reference" class="md-nav__link">
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Reference
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#references-and-the-magic" class="md-nav__link">
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References and The Magic
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#little-adventure" class="md-nav__link">
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Little Adventure
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</a>
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</li>
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</ul>
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</nav>
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</li>
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</ul>
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</div>
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</div>
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<div class="md-content">
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<article class="md-content__inner md-typeset">
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<h1 id="git">Git</h1>
|
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<h2 id="prerequisites">Prerequisites</h2>
|
|
<ol>
|
|
<li>Have Git installed <a href="https://git-scm.com/downloads">https://git-scm.com/downloads</a></li>
|
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<li>Have taken any git high level tutorial or following LinkedIn learning courses<ul>
|
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<li><a href="https://www.linkedin.com/learning/git-essential-training-the-basics/">https://www.linkedin.com/learning/git-essential-training-the-basics/</a></li>
|
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<li><a href="https://www.linkedin.com/learning/git-branches-merges-and-remotes/">https://www.linkedin.com/learning/git-branches-merges-and-remotes/</a></li>
|
|
<li><a href="https://git-scm.com/doc">The Official Git Docs</a></li>
|
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</ul>
|
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</li>
|
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</ol>
|
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<h2 id="what-to-expect-from-this-course">What to expect from this course</h2>
|
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<p>As an engineer in the field of computer science, having knowledge of version control tools becomes almost a requirement. While there are a lot of version control tools that exist today like SVN, Mercurial, etc, Git perhaps is the most used one and this course we will be working with Git. While this course does not start with Git 101 and expects basic knowledge of git as a prerequisite, it will reintroduce the git concepts known by you with details covering what is happening under the hood as you execute various git commands. So that next time you run a git command, you will be able to press enter more confidently!</p>
|
|
<h2 id="what-is-not-covered-under-this-course">What is not covered under this course</h2>
|
|
<p>Advanced usage and specifics of internal implementation details of Git.</p>
|
|
<h2 id="course-contents">Course Contents</h2>
|
|
<ol>
|
|
<li><a href="https://linkedin.github.io/school-of-sre/level101/git/git-basics/#git-basics">Git Basics</a></li>
|
|
<li><a href="https://linkedin.github.io/school-of-sre/level101/git/branches/">Working with Branches</a></li>
|
|
<li><a href="https://linkedin.github.io/school-of-sre/level101/git/github-hooks/#git-with-github">Git with Github</a></li>
|
|
<li><a href="https://linkedin.github.io/school-of-sre/level101/git/github-hooks/#hooks">Hooks</a></li>
|
|
</ol>
|
|
<h2 id="git-basics">Git Basics</h2>
|
|
<p>Though you might be aware already, let's revisit why we need a version control system. As the project grows and multiple developers start working on it, an efficient method for collaboration is warranted. Git helps the team collaborate easily and also maintains the history of the changes happening with the codebase.</p>
|
|
<h3 id="creating-a-git-repo">Creating a Git Repo</h3>
|
|
<p>Any folder can be converted into a git repository. After executing the following command, we will see a <code>.git</code> folder within the folder, which makes our folder a git repository. <strong>All the magic that git does, <code>.git</code> folder is the enabler for the same.</strong></p>
|
|
<pre><code class="language-bash"># creating an empty folder and changing current dir to it
|
|
$ cd /tmp
|
|
$ mkdir school-of-sre
|
|
$ cd school-of-sre/
|
|
|
|
# initialize a git repo
|
|
$ git init
|
|
Initialized empty Git repository in /private/tmp/school-of-sre/.git/
|
|
</code></pre>
|
|
<p>As the output says, an empty git repo has been initialized in our folder. Let's take a look at what is there.</p>
|
|
<pre><code class="language-bash">$ ls .git/
|
|
HEAD config description hooks info objects refs
|
|
</code></pre>
|
|
<p>There are a bunch of folders and files in the <code>.git</code> folder. As I said, all these enables git to do its magic. We will look into some of these folders and files. But for now, what we have is an empty git repository.</p>
|
|
<h3 id="tracking-a-file">Tracking a File</h3>
|
|
<p>Now as you might already know, let us create a new file in our repo (we will refer to the folder as <em>repo</em> now.) And see git status</p>
|
|
<pre><code class="language-bash">$ echo "I am file 1" > file1.txt
|
|
$ git status
|
|
On branch master
|
|
|
|
No commits yet
|
|
|
|
Untracked files:
|
|
(use "git add <file>..." to include in what will be committed)
|
|
|
|
file1.txt
|
|
|
|
nothing added to commit but untracked files present (use "git add" to track)
|
|
</code></pre>
|
|
<p>The current git status says <code>No commits yet</code> and there is one untracked file. Since we just created the file, git is not tracking that file. We explicitly need to ask git to track files and folders. (also checkout <a href="https://git-scm.com/docs/gitignore">gitignore</a>) And how we do that is via <code>git add</code> command as suggested in the above output. Then we go ahead and create a commit.</p>
|
|
<pre><code class="language-bash">$ git add file1.txt
|
|
$ git status
|
|
On branch master
|
|
|
|
No commits yet
|
|
|
|
Changes to be committed:
|
|
(use "git rm --cached <file>..." to unstage)
|
|
|
|
new file: file1.txt
|
|
|
|
$ git commit -m "adding file 1"
|
|
[master (root-commit) df2fb7a] adding file 1
|
|
1 file changed, 1 insertion(+)
|
|
create mode 100644 file1.txt
|
|
</code></pre>
|
|
<p>Notice how after adding the file, git status says <code>Changes to be committed:</code>. What it means is whatever is listed there, will be included in the next commit. Then we go ahead and create a commit, with an attached messaged via <code>-m</code>.</p>
|
|
<h3 id="more-about-a-commit">More About a Commit</h3>
|
|
<p>Commit is a snapshot of the repo. Whenever a commit is made, a snapshot of the current state of repo (the folder) is taken and saved. Each commit has a unique ID. (<code>df2fb7a</code> for the commit we made in the previous step). As we keep adding/changing more and more contents and keep making commits, all those snapshots are stored by git. Again, all this magic happens inside the <code>.git</code> folder. This is where all this snapshot or versions are stored <em>in an efficient manner.</em></p>
|
|
<h3 id="adding-more-changes">Adding More Changes</h3>
|
|
<p>Let us create one more file and commit the change. It would look the same as the previous commit we made.</p>
|
|
<pre><code class="language-bash">$ echo "I am file 2" > file2.txt
|
|
$ git add file2.txt
|
|
$ git commit -m "adding file 2"
|
|
[master 7f3b00e] adding file 2
|
|
1 file changed, 1 insertion(+)
|
|
create mode 100644 file2.txt
|
|
</code></pre>
|
|
<p>A new commit with ID <code>7f3b00e</code> has been created. You can issue <code>git status</code> at any time to see the state of the repository.</p>
|
|
<pre><code> **IMPORTANT: Note that commit IDs are long string (SHA) but we can refer to a commit by its initial few (8 or more) characters too. We will interchangeably using shorter and longer commit IDs.**
|
|
</code></pre>
|
|
<p>Now that we have two commits, let's visualize them:</p>
|
|
<pre><code class="language-bash">$ git log --oneline --graph
|
|
* 7f3b00e (HEAD -> master) adding file 2
|
|
* df2fb7a adding file 1
|
|
</code></pre>
|
|
<p><code>git log</code>, as the name suggests, prints the log of all the git commits. Here you see two additional arguments, <code>--oneline</code> prints the shorter version of the log, ie: the commit message only and not the person who made the commit and when. <code>--graph</code> prints it in graph format.</p>
|
|
<p><strong>Now at this moment the commits might look like just one in each line but all commits are stored as a tree like data structure internally by git. That means there can be two or more children commits of a given commit. And not just a single line of commits. We will look more into this part when we get to the Branches section. For now this is our commit history:</strong></p>
|
|
<pre><code class="language-bash"> df2fb7a ===> 7f3b00e
|
|
</code></pre>
|
|
<h3 id="are-commits-really-linked">Are commits really linked?</h3>
|
|
<p>As I just said, the two commits we just made are linked via tree like data structure and we saw how they are linked. But let's actually verify it. Everything in git is an object. Newly created files are stored as an object. Changes to file are stored as an objects and even commits are objects. To view contents of an object we can use the following command with the object's ID. We will take a look at the contents of the second commit</p>
|
|
<pre><code class="language-bash">$ git cat-file -p 7f3b00e
|
|
tree ebf3af44d253e5328340026e45a9fa9ae3ea1982
|
|
parent df2fb7a61f5d40c1191e0fdeb0fc5d6e7969685a
|
|
author Sanket Patel <spatel1@linkedin.com> 1603273316 -0700
|
|
committer Sanket Patel <spatel1@linkedin.com> 1603273316 -0700
|
|
|
|
adding file 2
|
|
</code></pre>
|
|
<p>Take a note of <code>parent</code> attribute in the above output. It points to the commit id of the first commit we made. So this proves that they are linked! Additionally you can see the second commit's message in this object. As I said all this magic is enabled by <code>.git</code> folder and the object to which we are looking at also is in that folder.</p>
|
|
<pre><code class="language-bash">$ ls .git/objects/7f/3b00eaa957815884198e2fdfec29361108d6a9
|
|
.git/objects/7f/3b00eaa957815884198e2fdfec29361108d6a9
|
|
</code></pre>
|
|
<p>It is stored in <code>.git/objects/</code> folder. All the files and changes to them as well are stored in this folder.</p>
|
|
<h3 id="the-version-control-part-of-git">The Version Control part of Git</h3>
|
|
<p>We already can see two commits (versions) in our git log. One thing a version control tool gives you is ability to browse back and forth in history. For example: some of your users are running an old version of code and they are reporting an issue. In order to debug the issue, you need access to the old code. The one in your current repo is the latest code. In this example, you are working on the second commit (7f3b00e) and someone reported an issue with the code snapshot at commit (df2fb7a). This is how you would get access to the code at any older commit</p>
|
|
<pre><code class="language-bash"># Current contents, two files present
|
|
$ ls
|
|
file1.txt file2.txt
|
|
|
|
# checking out to (an older) commit
|
|
$ git checkout df2fb7a
|
|
Note: checking out 'df2fb7a'.
|
|
|
|
You are in 'detached HEAD' state. You can look around, make experimental
|
|
changes and commit them, and you can discard any commits you make in this
|
|
state without impacting any branches by performing another checkout.
|
|
|
|
If you want to create a new branch to retain commits you create, you may
|
|
do so (now or later) by using -b with the checkout command again. Example:
|
|
|
|
git checkout -b <new-branch-name>
|
|
|
|
HEAD is now at df2fb7a adding file 1
|
|
|
|
# checking contents, can verify it has old contents
|
|
$ ls
|
|
file1.txt
|
|
</code></pre>
|
|
<p>So this is how we would get access to old versions/snapshots. All we need is a <em>reference</em> to that snapshot. Upon executing <code>git checkout ...</code>, what git does for you is use the <code>.git</code> folder, see what was the state of things (files and folders) at that version/reference and replace the contents of current directory with those contents. The then-existing content will no longer be present in the local dir (repo) but we can and will still get access to them because they are tracked via git commit and <code>.git</code> folder has them stored/tracked.</p>
|
|
<h3 id="reference">Reference</h3>
|
|
<p>I mention in the previous section that we need a <em>reference</em> to the version. By default, git repo is made of tree of commits. And each commit has a unique IDs. But the unique ID is not the only thing we can reference commits via. There are multiple ways to reference commits. For example: <code>HEAD</code> is a reference to current commit. <em>Whatever commit your repo is checked out at, <code>HEAD</code> will point to that.</em> <code>HEAD~1</code> is reference to previous commit. So while checking out previous version in section above, we could have done <code>git checkout HEAD~1</code>.</p>
|
|
<p>Similarly, master is also a reference (to a branch). Since git uses tree like structure to store commits, there of course will be branches. And the default branch is called <code>master</code>. Master (or any branch reference) will point to the latest commit in the branch. Even though we have checked out to the previous commit in out repo, <code>master</code> still points to the latest commit. And we can get back to the latest version by checkout at <code>master</code> reference</p>
|
|
<pre><code class="language-bash">$ git checkout master
|
|
Previous HEAD position was df2fb7a adding file 1
|
|
Switched to branch 'master'
|
|
|
|
# now we will see latest code, with two files
|
|
$ ls
|
|
file1.txt file2.txt
|
|
</code></pre>
|
|
<p>Note, instead of <code>master</code> in above command, we could have used commit's ID as well.</p>
|
|
<h3 id="references-and-the-magic">References and The Magic</h3>
|
|
<p>Let's look at the state of things. Two commits, <code>master</code> and <code>HEAD</code> references are pointing to the latest commit</p>
|
|
<pre><code class="language-bash">$ git log --oneline --graph
|
|
* 7f3b00e (HEAD -> master) adding file 2
|
|
* df2fb7a adding file 1
|
|
</code></pre>
|
|
<p>The magic? Let's examine these files:</p>
|
|
<pre><code class="language-bash">$ cat .git/refs/heads/master
|
|
7f3b00eaa957815884198e2fdfec29361108d6a9
|
|
</code></pre>
|
|
<p>Viola! Where master is pointing to is stored in a file. <strong>Whenever git needs to know where master reference is pointing to, or if git needs to update where master points, it just needs to update the file above.</strong> So when you create a new commit, a new commit is created on top of the current commit and the master file is updated with the new commit's ID.</p>
|
|
<p>Similary, for <code>HEAD</code> reference:</p>
|
|
<pre><code class="language-bash">$ cat .git/HEAD
|
|
ref: refs/heads/master
|
|
</code></pre>
|
|
<p>We can see <code>HEAD</code> is pointing to a reference called <code>refs/heads/master</code>. So <code>HEAD</code> will point where ever the <code>master</code> points.</p>
|
|
<h3 id="little-adventure">Little Adventure</h3>
|
|
<p>We discussed how git will update the files as we execute commands. But let's try to do it ourselves, by hand, and see what happens.</p>
|
|
<pre><code class="language-bash">$ git log --oneline --graph
|
|
* 7f3b00e (HEAD -> master) adding file 2
|
|
* df2fb7a adding file 1
|
|
</code></pre>
|
|
<p>Now let's change master to point to the previous/first commit.</p>
|
|
<pre><code class="language-bash">$ echo df2fb7a61f5d40c1191e0fdeb0fc5d6e7969685a > .git/refs/heads/master
|
|
$ git log --oneline --graph
|
|
* df2fb7a (HEAD -> master) adding file 1
|
|
|
|
# RESETTING TO ORIGINAL
|
|
$ echo 7f3b00eaa957815884198e2fdfec29361108d6a9 > .git/refs/heads/master
|
|
$ git log --oneline --graph
|
|
* 7f3b00e (HEAD -> master) adding file 2
|
|
* df2fb7a adding file 1
|
|
</code></pre>
|
|
<p>We just edited the <code>master</code> reference file and now we can see only the first commit in git log. Undoing the change to the file brings the state back to original. Not so much of magic, is it?</p>
|
|
|
|
|
|
|
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|
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</article>
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