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Availability: Unix.
The commands module contains wrapper functions for
os.popen() which take a system command as a string and
return any output generated by the command and, optionally, the exit
status.
The subprocess module provides more powerful facilities for
spawning new processes and retrieving their results. Using the
subprocess module is preferable to using the commands
module.
The commands module defines the following functions:
-
Execute the string cmd in a shell with 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
wait().
-
Like getstatusoutput(), except the exit status is ignored
and the return value is a string containing the command's output.
-
Return the output of "ls -ld file" as a string. This
function uses the getoutput() function, and properly
escapes backslashes and dollar signs in the argument.
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'
>>> commands.getstatus('/bin/ls')
'-rwxr-xr-x 1 root 13352 Oct 14 1994 /bin/ls'
See Also:
- Module subprocess:
- Module for spawning and managing subprocesses.
Release 2.5.2, documentation updated on 21th February, 2008.
See About this document... for information on suggesting changes.
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