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<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12"> 
#!/usr/bin/tclsh
# filename hello2.tcl
# This program code shows 
# metacharacter usage

puts stdout "Hello, World! \a"
puts stdout {Hello, World! \a}

set Pints 6
set Days 7

puts stdout "The answer to the \
 universe is [eval $Pints * $Days]!\n"
	
***
~/tcltk$ <b>./hello2.tcl</b>
Hello, World!
Hello, World! \a
The answer to everything is 42!

			</code>
</pre>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>Tcl metacharacters</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 2 页（共15 页）</nobr></font></td>
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<font size="2" face="Verdana, Arial, Helvetica">
<p>Metacharacters are those characters or character pairs that have 
				special meaning in the context of the Tcl/Tk environment, including 
				grouping statements, encapsulating strings, terminating statements 
				and more, as delineated in the following table. Many of these are 
				demonstrated in the code listing to the left. One special feature to notice is the difference in output when curly braces (which prevent 
				substitution and expansion) are used in place of double quotes.</p>
<table border="1">
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<th align="center" width="150pt">Character(s)</th><th align="center" width="250pt">Used as</th>
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<td width="150pt"><b>#</b></td><td width="250pt">Comment</td>
</tr>
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<td width="150pt"><b>;</b> or <b><i>newline</i></b></td><td width="250pt">Statement separators</td>
</tr>
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<td width="150pt"><code><b><i>Name</i></b></code></td><td width="250pt">A variable (case sensitive)</td>
</tr>
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<td width="150pt"><code><b><i>Name</i>(<i>idx</i>)</b></code></td><td width="250pt">Array Variable</td>
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<td width="150pt"><code><b><i>Name</i>(<i>j,k,l...</i>)</b></code></td><td width="250pt">Multidimensional Array</td>
</tr>
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<td width="150pt"><code><b>"</b><i>string</i><b>"</b></code></td><td width="250pt">Quoting with substitution</td>
</tr>
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<td width="150pt"><code><b>{</b><i>string</i><b>}</b></code></td><td width="250pt">Quoting without substitution</td>
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<td width="150pt"><code><b>[</b><i>string</i><b>]</b></code></td><td width="250pt">Command substitution</td>
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<td width="150pt"><code><b>\</b><i>char</i></code></td><td width="250pt">Backslash substitution</td>
</tr>
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<td width="150pt"><code><b>\</b></code></td><td width="250pt">Line continuation (at end of line)</td>
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