eryksun added the comment:
I expect Popen's shell=True option to use the same shell as os.system. The
POSIX spec for the [system function][1] requires running sh, as follows:
execl(<shell path>, "sh", "-c", command, (char *)0);
glibc uses "/bin/sh" for the shell path. Modifying the SHELL environment
variable doesn't affect the behavior of os.system. I would be surprised if
Popen's shell=True had been designed like that. Thankfully it's too late to
change this since it could break existing code. ;-)
The story is different on Windows. The CRT's system() prefers the shell that's
set in the ComSpec environment variable. So on Windows Popen uses
os.environ.get("COMSPEC", "cmd.exe").
[1]: http://pubs.opengroup.org/onlinepubs/9699919799/functions/system.html
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nosy: +eryksun
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