execute bash builtins in python

Steve Holden steve at holdenweb.com
Fri Mar 12 14:15:49 CET 2010

alex goretoy wrote:
> hi,
> i'm trying to write a section of my program that needs to run bash
> builtin alias and declare, i've googled and tried every type of example
> i could find no to avail. this is what I've tried below and it doesn't
> work, is there a way for me to execute a bah builin from python? what i
> need is to take alias output and pipe it to another command with python
> and return the results to a string or list.
>>>> p1=Popen(["alias"],stdout=PIPE)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.6/subprocess.py", line 621, in __init__
>     errread, errwrite)
>   File "/usr/lib/python2.6/subprocess.py", line 1126, in _execute_child
>     raise child_exception
> OSError: [Errno 2] No such file or directory
> if i add shell=True i get empty string and no thins error message
>>>> p1=Popen(["alias"],stdout=PIPE,shell=True)
>>>> p1
> <subprocess.Popen object at 0xb7589a4c>
>>>> p1.stdout.read()
> ''
> thank you,
> -Alex Goretoy
For shell=True I believe you should provide the command as a single
string, not a list of arguments.

>>> p1 = Popen("alias", stdout=PIPE, shell=True)

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