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‎shell/apa.html‎

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>附录 1. 附录</title><link rel="stylesheet" type="text/css" href="docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="shell,bash,zsh, awk,sed,curl,expect, grep,sort" /><link rel="home" href="index.html" title="Netkiller Shell 手札" /><link rel="up" href="index.html" title="Netkiller Shell 手札" /><link rel="prev" href="terminal/whiptail.html" title="6.4. whiptail - display dialog boxes from shell scripts" /></head><body><a xmlns="" href="//www.netkiller.cn/">Home</a> | <a xmlns="" href="//netkiller.github.io/">简体中文</a> | <a xmlns="" href="http://netkiller.sourceforge.net/">繁体中文</a> | <a xmlns="" href="/journal/index.html">杂文</a>
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| <a xmlns="" href="https://github.com/netkiller">Github</a> | <a xmlns="" href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a> | <a xmlns="" href="https://edu.51cto.com/lecturer/1703915.html">51CTO学院</a> | <a xmlns="" href="https://edu.csdn.net/lecturer/6423">CSDN程序员研修院</a> | <a xmlns="" href="http://my.oschina.net/neochen/">OSChina 博客</a> | <a xmlns="" href="https://cloud.tencent.com/developer/column/2078">腾讯云社区</a> | <a xmlns="" href="https://yq.aliyun.com/u/netkiller/">阿里云栖社区</a> | <a xmlns="" href="https://www.facebook.com/bg7nyt">Facebook</a> | <a xmlns="" href="http://cn.linkedin.com/in/netkiller/">Linkedin</a> | <a xmlns="" href="https://www.youtube.com/user/bg7nyt/videos">Youtube</a> | <a xmlns="" href="//www.netkiller.cn/home/donations.html">打赏(Donations)</a> | <a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">附录 1. 附录</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="terminal/whiptail.html">上一页</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> </td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;repo=netkiller.github.io&amp;type=watch&amp;count=true&amp;size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;repo=netkiller.github.io&amp;type=fork&amp;count=true&amp;size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;type=follow&amp;count=true&amp;size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td><td></td><td><a href="https://zhuanlan.zhihu.com/netkiller"><img src="/images/logo/zhihu-card-default.svg" height="25" /></a></td><td valign="middle"><a href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a> ｜ <a href="https://www.zhihu.com/club/1241768772601950208">多维度架构</a></td><td></td><td></td><td></td><td></td></tr></table><div class="appendix"><div class="titlepage"><div><div><h1 class="title"><a id="idm495117359312"></a>附录 1. 附录</h1></div></div></div><div class="toc"><p><strong>目录</strong></p><dl class="toc"><dt><span class="section"><a href="apa.html#idm495117358928">1.1. 参考文献</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idm495117358928"></a>1.1. 参考文献</h3></div></div></div><p>《高级Bash脚本编程指南》http://www.linuxsir.org/main/doc/abs/abs3.7cnhtm/index.html</p></div></div><div xmlns="" id="SOHUCS"></div><script xmlns="" charset="utf-8" type="text/javascript" src="https://cy-cdn.kuaizhan.com/upload/changyan.js"></script><script xmlns="" type="text/javascript">
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| <a xmlns="" href="https://github.com/netkiller">Github</a> | <a xmlns="" href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a> | <a xmlns="" href="https://www.facebook.com/bg7nyt">Facebook</a> | <a xmlns="" href="http://cn.linkedin.com/in/netkiller/">Linkedin</a> | <a xmlns="" href="https://www.youtube.com/user/bg7nyt/videos">Youtube</a> | <a xmlns="" href="//www.netkiller.cn/home/donations.html">打赏(Donations)</a> | <a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">附录 1. 附录</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="terminal/whiptail.html">上一页</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> </td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;repo=netkiller.github.io&amp;type=watch&amp;count=true&amp;size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;repo=netkiller.github.io&amp;type=fork&amp;count=true&amp;size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;type=follow&amp;count=true&amp;size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td><td></td><td><a href="https://zhuanlan.zhihu.com/netkiller"><img src="/images/logo/zhihu-card-default.svg" height="25" /></a></td><td valign="middle"><a href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a></td><td></td><td></td><td></td><td></td></tr></table><div class="appendix"><div class="titlepage"><div><div><h1 class="title"><a id="id994"></a>附录 1. 附录</h1></div></div></div><div class="toc"><p><strong>目录</strong></p><dl class="toc"><dt><span class="section"><a href="apa.html#id932">1.1. 参考文献</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="id932"></a>1.1. 参考文献</h3></div></div></div><p>《高级Bash脚本编程指南》http://www.linuxsir.org/main/doc/abs/abs3.7cnhtm/index.html</p></div></div><div xmlns="" id="SOHUCS"></div><script xmlns="" charset="utf-8" type="text/javascript" src="https://cy-cdn.kuaizhan.com/upload/changyan.js"></script><script xmlns="" type="text/javascript">
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window.changyan.api.config({
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appid: 'cyvwjQUG3',
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conf: 'prod_ef966242df3d8b5acb1e0ee9fc01cafe'

‎shell/author.html‎

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‎shell/bash/ch02s02.html‎

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>2.2. 切换身份</title><link rel="stylesheet" type="text/css" href="../docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="shell,bash,zsh, awk,sed,curl,expect, grep,sort" /><link rel="home" href="../index.html" title="Netkiller Shell 手札" /><link rel="up" href="index.html" title="第 2 章 Bash Shell" /><link rel="prev" href="index.html" title="第 2 章 Bash Shell" /><link rel="next" href="stdin-stdout-stderr.html" title="2.3. I/O 重定向" /></head><body><a xmlns="" href="//www.netkiller.cn/">Home</a> | <a xmlns="" href="//netkiller.github.io/">简体中文</a> | <a xmlns="" href="http://netkiller.sourceforge.net/">繁体中文</a> | <a xmlns="" href="/journal/index.html">杂文</a>
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| <a xmlns="" href="https://github.com/netkiller">Github</a> | <a xmlns="" href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a> | <a xmlns="" href="https://edu.51cto.com/lecturer/1703915.html">51CTO学院</a> | <a xmlns="" href="https://edu.csdn.net/lecturer/6423">CSDN程序员研修院</a> | <a xmlns="" href="http://my.oschina.net/neochen/">OSChina 博客</a> | <a xmlns="" href="https://cloud.tencent.com/developer/column/2078">腾讯云社区</a> | <a xmlns="" href="https://yq.aliyun.com/u/netkiller/">阿里云栖社区</a> | <a xmlns="" href="https://www.facebook.com/bg7nyt">Facebook</a> | <a xmlns="" href="http://cn.linkedin.com/in/netkiller/">Linkedin</a> | <a xmlns="" href="https://www.youtube.com/user/bg7nyt/videos">Youtube</a> | <a xmlns="" href="//www.netkiller.cn/home/donations.html">打赏(Donations)</a> | <a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.2. 切换身份</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="index.html">上一页</a> </td><th width="60%" align="center">第 2 章 Bash Shell</th><td width="20%" align="right"> <a accesskey="n" href="stdin-stdout-stderr.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;repo=netkiller.github.io&amp;type=watch&amp;count=true&amp;size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;repo=netkiller.github.io&amp;type=fork&amp;count=true&amp;size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;type=follow&amp;count=true&amp;size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td><td></td><td><a href="https://zhuanlan.zhihu.com/netkiller"><img src="/images/logo/zhihu-card-default.svg" height="25" /></a></td><td valign="middle"><a href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a> ｜ <a href="https://www.zhihu.com/club/1241768772601950208">多维度架构</a></td><td></td><td></td><td></td><td></td></tr></table><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idm495110758592"></a>2.2. 切换身份</h3></div></div></div><p>判断当前用户是否为root</p><pre class="screen">
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| <a xmlns="" href="https://github.com/netkiller">Github</a> | <a xmlns="" href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a> | <a xmlns="" href="https://www.facebook.com/bg7nyt">Facebook</a> | <a xmlns="" href="http://cn.linkedin.com/in/netkiller/">Linkedin</a> | <a xmlns="" href="https://www.youtube.com/user/bg7nyt/videos">Youtube</a> | <a xmlns="" href="//www.netkiller.cn/home/donations.html">打赏(Donations)</a> | <a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.2. 切换身份</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="index.html">上一页</a> </td><th width="60%" align="center">第 2 章 Bash Shell</th><td width="20%" align="right"> <a accesskey="n" href="stdin-stdout-stderr.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;repo=netkiller.github.io&amp;type=watch&amp;count=true&amp;size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;repo=netkiller.github.io&amp;type=fork&amp;count=true&amp;size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&amp;type=follow&amp;count=true&amp;size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td><td></td><td><a href="https://zhuanlan.zhihu.com/netkiller"><img src="/images/logo/zhihu-card-default.svg" height="25" /></a></td><td valign="middle"><a href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a></td><td></td><td></td><td></td><td></td></tr></table><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="id964"></a>2.2. 切换身份</h3></div></div></div><p>判断当前用户是否为root</p><pre class="screen">
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#!/bin/bash
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if [[ $EUID -ne 0 ]]; then

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