subprocess module: execution of standard binaries without shell?

[Visco Shaun]

hi all

while getting used to with subprocess module i failed in executuing a)
but succeeded in running b). Can anyone explain me why as i am providing
absolute path? Is this has to do anything with shared library.. which
must be accessed based on system variables?


a) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
close_fds=True)
==>OSError: [Errno 2] No such file or directory

b) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
close_fds=True, shell=True)