📄 0340bashshell-scripts.htm
字号:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
>
<html lang="zh-TW">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" >
<meta name="Author" content="VBird, 鸟哥" >
<meta name="Description" content="学习 Shell Scripts" >
<title>鸟哥的 Linux 私房菜 -- 学习 Shell Scripts</title>
<style type="text/css">
body {
background-color: #D3D3D3;
color: #000000;
background-attachment:fixed ;
}
body,th,td,input,select,textarea,select,checkbox {
font-family: '新细明体', 'Times New Roman', serif;
font-size: 11pt ;
}
a:link {text-decoration: none; color: blue}
a:visited {text-decoration: none; color: blue}
a:active {text-decoration: none; color: blue}
a:hover {text-decoration: underline; color: #ff0000}
table.head1 {width:100%; background-color: #FFCCCC;
border-style:groove;border-width:5px;border-color: #FFCCCC; margin:0;
padding: 5px 5px}
td.head1 {font: 10pt "新细明体", serif; color: #000099; }
td.info1 {font: 11pt "新细明体", serif; color: #000066; text-align:center; width:14%}
td.info2 {font: 11pt "新细明体", serif; color: #000066; text-align:center; width:12%}
*.info21 {font: 11pt "新细明体", serif; color: #000066; }
*.info22 {font: 11pt "新细明体", serif; color: blue ; }
*.info23 {font: 11pt "新细明体", serif; color: green ; }
td.info3 {font: 11pt "新细明体", serif; color: #000066; text-align:justify}
*.text_head0 {font-size:18pt; font-family:'标楷体','Times New Roman','Times', serif; }
*.text_head_en {font-size:18pt; font-family:'Times New Roman','Times', serif; }
*.text_h1 {font: 15pt "新细明体", serif; color: #0000BB; font-weight: bold }
*.text_h2 {font: 13pt "新细明体", serif; color: #0000BB; font-weight: bold }
*.text_import1 {font: 11pt "新细明体", serif; color: #000088; font-weight: bold }
*.text_import2 {font: 11pt "新细明体", serif; color: #000088; font-weight: normal}
*.text_vbird {font: 11pt "新细明体", serif; color: #000088; font-weight: normal;
font-style: italic;}
*.text_history {font: 10pt "新细明体", serif; color: #000066; }
*.text_date {font: 10pt "新细明体", serif; color: #3333FF; }
*.block1 {padding: 10px 20px 10px 25px; text-align:left }
*.block2 {padding: 10px 0px 10px 25px; text-align:left }
table.term2 {width: 350px; background-color: #000000;
border-style:groove;border-width:3px;border-color: #FFCCCC; margin:10px 0px;}
table.term {width: 580px; background-color: #000000;
border-style:groove;border-width:3px;border-color: #FFCCCC; margin:10px 0px;}
td.term {font: 10pt "细明体", Fixedsys, serif; color: #FFFFFF; }
*.term_hd {font: 10pt "细明体", Fixedsys, serif; color: #BBBBBB; }
*.term_note {font: 10pt "细明体", Fixedsys, serif; color: #777777; font-weight: normal }
*.term_note_b {font: 10pt "细明体", Fixedsys, serif; color: #FF77FF; font-weight: bolder }
*.term_command {font: 10pt "细明体", Fixedsys, serif; color: yellow ; font-weight: bolder }
*.term_write {font: 10pt "细明体", Fixedsys, serif; color: yellow ; font-weight: normal }
*.term_say {font: 10pt "细明体", Fixedsys, serif; color: #FF6666; font-weight: normal }
</style>
</head>
<body style="margin:0; padding:0">
<center>
<!-- 这里是关于页首按钮处的按钮程式 -->
<div style="text-align:center">
<span style="font-weight:bolder; color:#3333FF"><span class="text_head0">鸟哥的<span class="text_head_en">
Linux </span>私房菜</span></span><br />
<span style="color:#000080">为取得较佳浏览结果，请爱用 <a href="http://moztw.org" target="_blank">firefox</a>
浏览本网页</span><br />
<a href="http://linux.vbird.org/" target="_blank"
onmouseover="document.head_icon1.src='../images/icon_VBird_on.jpg'"
onfocus="document.head_icon1.src='../images/icon_VBird_on.jpg'"
onmouseout="document.head_icon1.src='../images/icon_VBird_off.jpg'">
<img alt="前往鸟哥的 Linux 私房菜馆首页" title="前往鸟哥的 Linux 私房菜馆首页" name="head_icon1"
src="../images/icon_VBird_off.jpg" border="0" /></a>
<a target="_blank" href="http://linux.vbird.org/linux_basic"
onmouseover="document.head_icon2.src='../images/icon_basic_on.jpg'"
onfocus="document.head_icon2.src='../images/icon_basic_on.jpg'"
onmouseout="document.head_icon2.src='../images/icon_basic_off.jpg'">
<img src="../images/icon_basic_off.jpg" border="0"
alt="前往 Linux 基础文件，新手请从头学起"
title="前往 Linux 基础文件，新手请从头学起" name="head_icon2" /></a>
<a target="_blank" href="http://linux.vbird.org/linux_server"
onmouseover="document.head_icon3.src='../images/icon_server_on.jpg'"
onfocus="document.head_icon3.src='../images/icon_server_on.jpg'"
onmouseout="document.head_icon3.src='../images/icon_server_off.jpg'">
<img src="../images/icon_server_off.jpg" border="0"
alt="前往 Linux 架站文件，网路基础那章节请务必参考！"
title="前往 Linux 架站文件，网路基础那章节请务必参考！" name="head_icon3" /></a>
<a target="_blank" href="http://linux.vbird.org/linux_security"
onmouseover="document.head_icon4.src='../images/icon_security_on.jpg'"
onfocus="document.head_icon4.src='../images/icon_security_on.jpg'"
onmouseout="document.head_icon4.src='../images/icon_security_off.jpg'">
<img src="../images/icon_security_off.jpg" border="0"
alt="前往『网路安全』相关文件网页" title="前往『网路安全』相关文件网页" name="head_icon4" /></a>
<a href="http://phorum.vbird.org" target="_blank"
onmouseover="document.head_icon5.src='../images/icon_forum_on.jpg'"
onfocus="document.head_icon5.src='../images/icon_forum_on.jpg'"
onmouseout="document.head_icon5.src='../images/icon_forum_off.jpg'">
<img src="../images/icon_forum_off.jpg" border="0"
alt="前往 Linux 新手讨论区，发问前务必查阅发文规则"
title="前往 Linux 新手讨论区，发问前务必查阅发文规则" name="head_icon5" /></a>
<a target="_blank" href="http://linux.vbird.org/adsl"
onmouseover="document.head_icon6.src='../images/icon_adsl_on.jpg'"
onfocus="document.head_icon6.src='../images/icon_adsl_on.jpg'"
onmouseout="document.head_icon6.src='../images/icon_adsl_off.jpg'">
<img src="../images/icon_adsl_off.jpg" border="0"
alt="前往『ADSL连线分享』相关文件网页" title="前往『ADSL连线分享』相关文件网页" name="head_icon6" /></a>
<a href="http://www.study-area.org" target="_blank"
onmouseover="document.head_icon7.src='../images/icon_study-area.jpg'"
onfocus="document.head_icon7.src='../images/icon_study-area.jpg'"
onmouseout="document.head_icon7.src='../images/icon_study-area.jpg'">
<img src="../images/icon_study-area.jpg" border="0"
alt="前往 Study Area 网站" title="前往 Study Area 网站" name="head_icon7" /></a>
<br />
</div>
<table summary="本文内容的排版" style="width:750px;
background-image:url('../images/VBirdLinux.jpg');
background-attachment:fixed;" border="0" cellspacing="0" cellpadding="0">
<tr><td style="width:16px; height:16px; background-image:url('../images/border-top-left.jpg');
font-size:6px"> </td>
<td style="width:718px; height:16px; font-size:6px;
background-image:url('../images/border-top-center.jpg')"> </td>
<td style="width:16px; height:16px; background-image:url('../images/border-top-right.jpg');
font-size:6px"> </td></tr>
<tr><td style="width:16px; font-size:6px;
background-image:url('../images/border-middle-left.jpg')"> </td>
<td width="718">
<!-- 本文的档头部分 -->
<div style="text-align:center">
<a href="0340bashshell-scripts.php">
<span class="text_head0">学习<span class="text_head_en"> Shell Scripts</span></span></a><br />
</div>
<div style="text-align:left">
<a href="0340bashshell-scripts.php?thisscreen=800x600"><!--切换解析度为 800x600--></a>
</div>
<div style="text-align:right">
<span class="text_history">最近更新日期∶2005/08/29</span>
</div>
<!-- 本文的档头部分 -->
<table class="head1" summary="排版∶文章档头的说明"><tr><td class="head1">
如果您真的很想要走资讯这条路，并且想要好好的管理好属于您的主机，那么，别说鸟哥不告诉您，
Shell Scripts 真的是必须要学习的一项课题呢！基本上， shell script 有点像是早期的批次档，
亦即是将一些指令汇整起来一次执行，但是 Shell script 拥有更强大的功能，那就是，
他可以进行类似程式 (program) 的撰写，并且，不需要经过编译 (compiler) 就能够执行，
真的很方便。加上，我们可透过 shell script 来简化我们日常的工作管理，
而且，整个 Linux 环境中，一些服务 (services) 的启动都是透过 shell script 的，
如果您对于 script 不了解，嘿嘿！发生问题时，可真是会求助无门喔！
所以，好好的学一学他吧！
</td></tr></table><br>
<!-- 本文的连结区部分 -->
<div class=block1>
<span class="text_h1">
1. <a href="#script">什么是 Shell Script</a><br>
<span class=text_h2>
1.1 <a href="#script_why">干嘛学习 shell scripts?</a><br>
1.2 <a href="#script_1st">第一支 script 的撰写与执行</a><br>
1.3 <a href="#script_be">撰写 shell script 的良好习惯建立</a><br>
</span>
2. <a href="#some_ex">简单的 shell script 练习∶</a><br>
3. <a href="#dis">善用判断式∶</a><br>
<span class=text_h2>
3.1 <a href="#test">利用 test 指令的测试功能</a><br>
3.2 <a href="#test_2">利用判断符号 [ ]</a><br>
3.3 <a href="#dis3">Shell script 的预设变数($0, $1...)</a><br>
</span>
4. <a href="#rule">条件判断式∶</a><br>
<span class=text_h2>
4.1 <a href="#ifthen">利用 if .... then</a><br>
4.2 <a href="#case">利用 case ..... esac 判断</a><br>
4.3 <a href="#function">利用 function 功能</a><br>
</span>
5. <a href="#loop">回圈 (loop)</a><br>
<span class=text_h2>
5.1 <a href="#while">while....do....done, until....do....done</a><br>
5.2 <a href="#for">for...do...done</a><br>
</span>
6. <a href="#debug">shell script 的追踪与 debug</a><br>
7. <a href="#FAQ">本章习题练习</a><br>
<span class=text_h2>
8. <a href="http://phorum.vbird.org/viewtopic.php?t=23886"
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -