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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>A real (small) Tk application</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 6 页（共7 页）</nobr></font></td>
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<p>I want an interface to the LAN changeover scripts that I run daily. 
				So let's use Tcl/Tk to build a small tool for ease of use. I want 
				it to offer selections based upon an ASCII configuration file that 
				lives in my home directory. That file contains the data shown in 
				the listing that follows:</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
# ~/.netsetrc
# 03.26.2001 bilbrey
# space between name and command

Home /usr/local/bin/nethome
Office /usr/local/bin/netoffice
Admin /usr/local/bin/netadmin
			</code>
</pre>
<p>The application (a full listing and image is shown on the next panel) 
				reads the configuration file and parses each non-blank, non-comment line 
				for a button name and its associated action. While the script would 
				be easier to write by defining three buttons to run explicit 
				programs, this more general solution allows me to add just about any 
				feature I want by only adding a single line to 
				<code>~/.netsetrc</code>.</p>
<p>A drawback of the code is that it isn't tolerant of a badly formatted 
				config file. It expects a one-word button name followed by a single 
				space followed by the command (with arguments, if necessary) to be 
				executed on the button press. But then, a configuration file is 
				theoretically easier to keep in line than unstructured user input.</p>
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