<!DOCTYPE html PUBLIC
"-//W3C//DTD HTML 4.0 Transitional//EN">
<link rel=
"STYLESHEET" href=
"lib.css" type='text/css'
/>
<link rel=
"SHORTCUT ICON" href=
"../icons/pyfav.png" type=
"image/png" />
<link rel='start' href='../index.html' title='Python Documentation Index'
/>
<link rel=
"first" href=
"lib.html" title='Python Library Reference'
/>
<link rel='contents' href='contents.html'
title=
"Contents" />
<link rel='index' href='genindex.html' title='Index'
/>
<link rel='last' href='about.html' title='About this document...'
/>
<link rel='help' href='about.html' title='About this document...'
/>
<link rel=
"next" href=
"module-shlex.html" />
<link rel=
"prev" href=
"module-calendar.html" />
<link rel=
"parent" href=
"misc.html" />
<link rel=
"next" href=
"Cmd-objects.html" />
<meta name='aesop' content='information'
/>
<title>5.20 cmd -- Support for line-oriented command interpreters
</title>
<div id='top-navigation-panel' xml:id='top-navigation-panel'
>
<table align=
"center" width=
"100%" cellpadding=
"0" cellspacing=
"2">
<td class='online-navigation'
><a rel=
"prev" title=
"5.19 calendar "
href=
"module-calendar.html"><img src='../icons/previous.png'
border='
0' height='
32' alt='Previous Page' width='
32'
/></A></td>
<td class='online-navigation'
><a rel=
"parent" title=
"5. Miscellaneous Services"
href=
"misc.html"><img src='../icons/up.png'
border='
0' height='
32' alt='Up One Level' width='
32'
/></A></td>
<td class='online-navigation'
><a rel=
"next" title=
"5.20.1 Cmd Objects"
href=
"Cmd-objects.html"><img src='../icons/next.png'
border='
0' height='
32' alt='Next Page' width='
32'
/></A></td>
<td align=
"center" width=
"100%">Python Library Reference
</td>
<td class='online-navigation'
><a rel=
"contents" title=
"Table of Contents"
href=
"contents.html"><img src='../icons/contents.png'
border='
0' height='
32' alt='Contents' width='
32'
/></A></td>
<td class='online-navigation'
><a href=
"modindex.html" title=
"Module Index"><img src='../icons/modules.png'
border='
0' height='
32' alt='Module Index' width='
32'
/></a></td>
<td class='online-navigation'
><a rel=
"index" title=
"Index"
href=
"genindex.html"><img src='../icons/index.png'
border='
0' height='
32' alt='Index' width='
32'
/></A></td>
<div class='online-navigation'
>
<b class=
"navlabel">Previous:
</b>
<a class=
"sectref" rel=
"prev" href=
"module-calendar.html">5.19 calendar
</A>
<b class=
"navlabel">Up:
</b>
<a class=
"sectref" rel=
"parent" href=
"misc.html">5. Miscellaneous Services
</A>
<b class=
"navlabel">Next:
</b>
<a class=
"sectref" rel=
"next" href=
"Cmd-objects.html">5.20.1 Cmd Objects
</A>
<!--End of Navigation Panel-->
<H1><A NAME=
"SECTION0072000000000000000000">
5.20 <tt class=
"module">cmd
</tt> --
Support for line-oriented command interpreters
</A>
<A NAME=
"module-cmd"></A>
The
<tt class=
"class">Cmd
</tt> class provides a simple framework for writing
line-oriented command interpreters. These are often useful for
test harnesses, administrative tools, and prototypes that will
later be wrapped in a more sophisticated interface.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><span class=
"typelabel">class
</span> <tt id='l2h-
1460' xml:id='l2h-
1460'
class=
"class">Cmd
</tt></b>(
</nobr></td>
<td><var></var><big>[
</big><var>completekey
</var><big>[
</big><var>,
stdin
</var><big>[
</big><var>, stdout
</var><big>]
</big><var></var><big>]
</big><var></var><big>]
</big><var></var>)
</td></tr></table></dt>
A
<tt class=
"class">Cmd
</tt> instance or subclass instance is a line-oriented
interpreter framework. There is no good reason to instantiate
<tt class=
"class">Cmd
</tt> itself; rather, it's useful as a superclass of an
interpreter class you define yourself in order to inherit
<tt class=
"class">Cmd
</tt>'s methods and encapsulate action methods.
The optional argument
<var>completekey
</var> is the
<tt class=
"module"><a href=
"module-readline.html">readline
</a></tt> name
of a completion key; it defaults to
<kbd>Tab
</kbd>. If
<var>completekey
</var> is
not
<tt class=
"constant">None
</tt> and
<tt class=
"module"><a href=
"module-readline.html">readline
</a></tt> is available, command completion
The optional arguments
<var>stdin
</var> and
<var>stdout
</var> specify the
input and output file objects that the Cmd instance or subclass
instance will use for input and output. If not specified, they
will default to
<var>sys.stdin
</var> and
<var>sys.stdout
</var>.
<span class=
"versionnote">Changed in version
2.3:
The
<var>stdin
</var> and
<var>stdout
</var> parameters were added..
</span>
<p><br /></p><hr class='online-navigation'
/>
<div class='online-navigation'
>
<!--Table of Child-Links-->
<A NAME=
"CHILD_LINKS"><STRONG>Subsections
</STRONG></a>
<LI><A href=
"Cmd-objects.html">5.20.1 Cmd Objects
</a>
<!--End of Table of Child-Links-->
<div class='online-navigation'
>
<table align=
"center" width=
"100%" cellpadding=
"0" cellspacing=
"2">
<td class='online-navigation'
><a rel=
"prev" title=
"5.19 calendar "
href=
"module-calendar.html"><img src='../icons/previous.png'
border='
0' height='
32' alt='Previous Page' width='
32'
/></A></td>
<td class='online-navigation'
><a rel=
"parent" title=
"5. Miscellaneous Services"
href=
"misc.html"><img src='../icons/up.png'
border='
0' height='
32' alt='Up One Level' width='
32'
/></A></td>
<td class='online-navigation'
><a rel=
"next" title=
"5.20.1 Cmd Objects"
href=
"Cmd-objects.html"><img src='../icons/next.png'
border='
0' height='
32' alt='Next Page' width='
32'
/></A></td>
<td align=
"center" width=
"100%">Python Library Reference
</td>
<td class='online-navigation'
><a rel=
"contents" title=
"Table of Contents"
href=
"contents.html"><img src='../icons/contents.png'
border='
0' height='
32' alt='Contents' width='
32'
/></A></td>
<td class='online-navigation'
><a href=
"modindex.html" title=
"Module Index"><img src='../icons/modules.png'
border='
0' height='
32' alt='Module Index' width='
32'
/></a></td>
<td class='online-navigation'
><a rel=
"index" title=
"Index"
href=
"genindex.html"><img src='../icons/index.png'
border='
0' height='
32' alt='Index' width='
32'
/></A></td>
<div class='online-navigation'
>
<b class=
"navlabel">Previous:
</b>
<a class=
"sectref" rel=
"prev" href=
"module-calendar.html">5.19 calendar
</A>
<b class=
"navlabel">Up:
</b>
<a class=
"sectref" rel=
"parent" href=
"misc.html">5. Miscellaneous Services
</A>
<b class=
"navlabel">Next:
</b>
<a class=
"sectref" rel=
"next" href=
"Cmd-objects.html">5.20.1 Cmd Objects
</A>
<span class=
"release-info">Release
2.4.2, documentation updated on
28 September
2005.
</span>
<!--End of Navigation Panel-->
See
<i><a href=
"about.html">About this document...
</a></i> for information on suggesting changes.