New submission from Jan Studený:
According to POSIX specification the pathname of user shell is stored in SHELL
(environmental variable, see
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08)
so I think that is good idea to use that pathname instead of hardcoded
R. David Murray added the comment:
Thanks for the suggestion, but that would make programs using subprocess
non-portable. There is an open issue to use the *default* shell instead of
hard coding it (because the sh-alike is not at /bin/sh on, eg, Android), but
using the user shell would break
