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<H1><A NAME="SECTION00101300000000000000000">
8.13 <tt class="module">pipes</tt> --
Interface to shell pipelines</A>
</H1>
<P>
<p class='availability'>Availability: <span
class='platform'>Unix</span>.</p>
<P>
The <tt class="module">pipes</tt> module defines a class to abstract the concept of
a <i>pipeline</i> -- a sequence of convertors from one file to
another.
<P>
Because the module uses <b class="program">/bin/sh</b> command lines, a POSIX or
compatible shell for <tt class="function">os.system()</tt> and <tt class="function">os.popen()</tt>
is required.
<P>
The <tt class="module">pipes</tt> module defines the following class:
<P>
<dl><dt><b><a name='l2h-1877'><tt class='class'>Template</tt></a></b> ()
<dd>
An abstraction of a pipeline.
</dl>
<P>
Example:
<P>
<dl><dd><pre class="verbatim">
>>> import pipes
>>> t=pipes.Template()
>>> t.append('tr a-z A-Z', '--')
>>> f=t.open('/tmp/1', 'w')
>>> f.write('hello world')
>>> f.close()
>>> open('/tmp/1').read()
'HELLO WORLD'
</pre></dl>
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