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author | Georg Brandl <georg@python.org> | 2007-08-15 14:28:22 (GMT) |
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committer | Georg Brandl <georg@python.org> | 2007-08-15 14:28:22 (GMT) |
commit | 116aa62bf54a39697e25f21d6cf6799f7faa1349 (patch) | |
tree | 8db5729518ed4ca88e26f1e26cc8695151ca3eb3 /Doc/library/commands.rst | |
parent | 739c01d47b9118d04e5722333f0e6b4d0c8bdd9e (diff) | |
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Move the 3k reST doc tree in place.
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diff --git a/Doc/library/commands.rst b/Doc/library/commands.rst new file mode 100644 index 0000000..79e3d73 --- /dev/null +++ b/Doc/library/commands.rst @@ -0,0 +1,53 @@ + +:mod:`commands` --- Utilities for running commands +================================================== + +.. module:: commands + :platform: Unix + :synopsis: Utility functions for running external commands. +.. sectionauthor:: Sue Williams <sbw@provis.com> + + +The :mod:`commands` module contains wrapper functions for :func:`os.popen` which +take a system command as a string and return any output generated by the command +and, optionally, the exit status. + +The :mod:`subprocess` module provides more powerful facilities for spawning new +processes and retrieving their results. Using the :mod:`subprocess` module is +preferable to using the :mod:`commands` module. + +The :mod:`commands` module defines the following functions: + + +.. function:: getstatusoutput(cmd) + + Execute the string *cmd* in a shell with :func:`os.popen` and return a 2-tuple + ``(status, output)``. *cmd* is actually run as ``{ cmd ; } 2>&1``, so that the + returned output will contain output or error messages. A trailing newline is + stripped from the output. The exit status for the command can be interpreted + according to the rules for the C function :cfunc:`wait`. + + +.. function:: getoutput(cmd) + + Like :func:`getstatusoutput`, except the exit status is ignored and the return + value is a string containing the command's output. + +Example:: + + >>> import commands + >>> commands.getstatusoutput('ls /bin/ls') + (0, '/bin/ls') + >>> commands.getstatusoutput('cat /bin/junk') + (256, 'cat: /bin/junk: No such file or directory') + >>> commands.getstatusoutput('/bin/junk') + (256, 'sh: /bin/junk: not found') + >>> commands.getoutput('ls /bin/ls') + '/bin/ls' + + +.. seealso:: + + Module :mod:`subprocess` + Module for spawning and managing subprocesses. + |