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📁 鸟哥的linux私房菜
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<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>
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<!-- 本文的档头部分 -->
<div style="text-align:center">
    <a href="0320bash.php">
    <span class="text_head0">认识<span class="text_head_en"> BASH Shell </span></span></a><br />
</div>
    <div style="text-align:left">
        <a href="0320bash.php?thisscreen=800x600"><!--切换解析度为 800x600--></a>
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    <div style="text-align:right">
        <span class="text_history">最近更新日期∶2006/10/05</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">
	文字模式 (command line) 这种指令下达的方式，在 Linux 里面，其实就相当于是 bash 的工具与介面！
	因为 Linux 就是以 bash 为预设的 shell 的！那么前几章我们都已经很快乐的进行了很多的指令下达棉～
	所以说， bash shell 根本就不难吧～是啦！只要能够熟悉的话，那么确实他也不是这么不可亲近的一项工具啊～
	这个章节中，鸟哥会由变数谈起，先讲到环境变数的功能与修改的问题，
	然后会继续提到历史指令的运用。接下来，就会谈一下『资料流重导向』这个重要概念，
	最后就是管线命令的利用啦！好好清一清脑门，准备用功去棉～ ^_^
	这个章节几乎是所有 command line 与未来主机维护与管理的重要基础，一定要好好仔细的阅读喔！
</td></tr></table><br>

<!-- 本文的连结区部分 -->
<div class=block1>
<span class="text_h1">
1. <a href="#bash">Bash shell</a><br>
	<span class=text_h2>
	    1.1 <a href="#bash_what">什么是 shell ？</a><br>
	    1.2 <a href="#bash_shells">系统的 shell 与 /etc/shells 功能</a><br>
	    1.3 <a href="#bash_bash">Bash shell 的功能</a><br>
	    1.4 <a href="#bash_type">Bash shell 的内建命令∶ type</a><br>
	    1.5 <a href="#bash_command">指令的下达</a><br>
	</span>
2. <a href="#variable">Shell 的变数功能</a><br>
	<span class=text_h2>
	    2.1 <a href="#variable_echo">变数的取用与设定</a>∶<a href="#echo">echo</a>, 
		<a href="#variable_rule">变数设定规则</a>, <a href="#unset">unset</a><br>
	    2.2 <a href="#variable_use">变数的用途？</a><br>
	    2.3 <a href="#variable_environ">环境变数的功能</a>∶
		<a href="#env">env</a>, <a href="#variable_environ_im">一些重要的环境变数</a>,
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