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+
+:mod:`pipes` --- Interface to shell pipelines
+=============================================
+
+.. module:: pipes
+   :platform: Unix
+   :synopsis: A Python interface to Unix shell pipelines.
+.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>
+
+
+The :mod:`pipes` module defines a class to abstract the concept of a *pipeline*
+--- a sequence of converters from one file to  another.
+
+Because the module uses :program:`/bin/sh` command lines, a POSIX or compatible
+shell for :func:`os.system` and :func:`os.popen` is required.
+
+The :mod:`pipes` module defines the following class:
+
+
+.. class:: Template()
+
+   An abstraction of a pipeline.
+
+Example::
+
+   >>> 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'
+
+
+.. _template-objects:
+
+Template Objects
+----------------
+
+Template objects following methods:
+
+
+.. method:: Template.reset()
+
+   Restore a pipeline template to its initial state.
+
+
+.. method:: Template.clone()
+
+   Return a new, equivalent, pipeline template.
+
+
+.. method:: Template.debug(flag)
+
+   If *flag* is true, turn debugging on. Otherwise, turn debugging off. When
+   debugging is on, commands to be executed are printed, and the shell is given
+   ``set -x`` command to be more verbose.
+
+
+.. method:: Template.append(cmd, kind)
+
+   Append a new action at the end. The *cmd* variable must be a valid bourne shell
+   command. The *kind* variable consists of two letters.
+
+   The first letter can be either of ``'-'`` (which means the command reads its
+   standard input), ``'f'`` (which means the commands reads a given file on the
+   command line) or ``'.'`` (which means the commands reads no input, and hence
+   must be first.)
+
+   Similarly, the second letter can be either of ``'-'`` (which means  the command
+   writes to standard output), ``'f'`` (which means the  command writes a file on
+   the command line) or ``'.'`` (which means the command does not write anything,
+   and hence must be last.)
+
+
+.. method:: Template.prepend(cmd, kind)
+
+   Add a new action at the beginning. See :meth:`append` for explanations of the
+   arguments.
+
+
+.. method:: Template.open(file, mode)
+
+   Return a file-like object, open to *file*, but read from or written to by the
+   pipeline.  Note that only one of ``'r'``, ``'w'`` may be given.
+
+
+.. method:: Template.copy(infile, outfile)
+
+   Copy *infile* to *outfile* through the pipe.
+