Fredrik Lundh wrote:
> [EMAIL PROTECTED] wrote:
>
> > I can't see any obvious way to ask subprocess to use a shell other than
> > the default.
>
> -c ?
>
> >>> f = Popen(["/bin/bash", "-c", "set|grep IFS"], stdout=PIPE)
> >>> f.stdout.read()
> "IFS=$' \\t\\n'\n"
> >>> f = Popen(["/bin/sh", "-c", "set|grep IFS"], stdout=PIPE)
> >>> f.stdout.read()
> "IFS=' \t\n"
It solves my problem:
>>> f = sub.Popen(['/bin/sh', '-c', 'set|grep IFS'], stdout=sub.PIPE)
>>> f.stdout.read()
"BASH_EXECUTION_STRING='set|grep IFS'\nIFS=' \t\n"
>>> f = sub.Popen(['/bin/bash', '-c', 'set|grep IFS'], stdout=sub.PIPE)
>>> f.stdout.read()
"BASH_EXECUTION_STRING='set|grep IFS'\nIFS=$' \\t\\n'\n"
But I still don't understand what is happening. The manual says that
when shell=True the executable argument specifies which shell to use:
>>> f = sub.Popen('set|grep IFS', shell=True, executable='/bin/sh',
>>> stdout=sub.PIPE)
>>> f.stdout.read()
"BASH_EXECUTION_STRING='set|grep IFS'\nIFS=' \t\n"
>>> f = sub.Popen('set|grep IFS', shell=True, executable='/bin/bash',
>>> stdout=sub.PIPE)
>>> f.stdout.read()
"BASH_EXECUTION_STRING='set|grep IFS'\nIFS=' \t\n"
To make my confusion bigger, in Fedora sh is just a link to bash:
$ ll /bin/*sh
-rwxr-xr-x 1 root root 720888 Feb 11 2006 /bin/bash
lrwxrwxrwx 1 root root 4 Aug 28 22:53 /bin/csh -> tcsh
-rwxr-xr-x 1 root root 1175496 Aug 17 13:19 /bin/ksh
lrwxrwxrwx 1 root root 4 Feb 24 2006 /bin/sh -> bash
-rwxr-xr-x 1 root root 349312 Aug 17 15:20 /bin/tcsh
-rwxr-xr-x 1 root root 514668 Feb 12 2006 /bin/zsh
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