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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>What makes Tcl tick?</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>In the following listing, you'll find a common first example
				program, as implemented in Tcl. This is a complete script: the 
				first line invokes the tclsh environment, and the second does 
				the actual work. Create the script with a text editor of your
				choosing, make it executable by typing 
				<code><b>chmod +x hello.tcl</b></code>, then 
				execute it to test your handiwork.</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 and Tk are interpreted, extensible scripting languages.  
				The license, which is
				very similar to the BSD license, permits free 
				use under any circumstances, as long as the copyright is 
				retained in all copies and notices pass verbatim in any 
				distribution. The license terms make Tcl/Tk free software.</p>
<p>Tcl/Tk is an interpreted environment. The Tcl interpreter can be 
				extended by adding pre-compiled C functions, which can be 
				called from within the Tcl environment. These extensions can 
				be custom for a specific purpose, or generic and widely useful. 
				We'll look at a number of extensions later in the tutorial, 
				with special attention given to the first extension, the 
				very popular <i>Expect</i>.</p>
<p>In next few panels, we'll review the major features of the Tcl language, 
				from metacharacters and global variables, to operators, mathematical 
				functions, and core commands. After all, the commands make Tcl/Tk 
				the distinctive evolving language it is. Bear in mind that we do not 
				have the space in this tutorial to cover every command. The highlights
				are here, the depths are yours to explore at a later date.</p>
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