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关于嵌入式编程的tcl语法的资料

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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>Tcl tick 的构成</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 1 页（共15 页）</nobr></font></td>
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<p>在下面的清单中，将会发现第一个很常见的示例程序，它是用 Tcl 实现的。这是一个完整的脚本：第一行命令调用 tclsh 环境，第二行命令执行实际工作。用您所选择的文本编辑器创建该脚本，输入	<code>
							<b>chmod +x hello.tcl</b>
						</code> 使之成为可执行文件，然后执行它以测试您这件&ldquo;作品&rdquo;。</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
~/tcltk$ <b>cat hello.tcl</b>
#!/usr/bin/tclsh 
puts stdout {Hello, World!}

~/tcltk$ <b>./hello.tcl</b>
Hello, World!
			</code>
</pre>
<p>Tcl 和 Tk 是解释型的、可扩展脚本语言。与 BSD 许可证十分相似，该许可证允许在任何情况下自由使用该软件，只要在所有副本中保留该版权并且在任何分发中一字不差地传递通告。这个许可证条款使 Tcl/Tk 成为自由软件。</p>
<p>Tcl/Tk 是一种解释型环境。可以通过添加预编译的 C 函数来扩展 Tcl 解释器，可从 Tcl 环境内部调用 Tcl 解释器。可以为特定目的或一般的以及广泛使用的而定制这些扩展。我们将在教程的后面看一些扩展并着重看一下第一个扩展 — 非常流行的 <i>Expect</i>。</p>
<p>在接下来的几屏中，将回顾 Tcl 语言的一些主要特性，从元字符和全局变量到运算符、数学函数以及核心命令。毕竟，这些命令使 Tcl/Tk 成为有特色的，逐步发展的语言。请记住，在本教程中没有篇幅涉及每条命令。这里只突出一部分，以后您可以更进一步了解 Tcl/Tk。</p>
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