Why does simple echo in subprocess not working

Question

I\'m trying to perform simple echo operation using subprocess:

import subprocess
import shlex

cmd = \'echo $HOME\'
proc = subprocess.Popen(shlex.split(cmd),         


        

Answer 1

You are confusing the two different invocations of Popen. Either of these will work:

proc=subprocess.Popen(['/bin/echo', 'hello', 'world'], shell=False, stdout=subprocess.PIPE)

or

proc=subprocess.Popen('echo hello world', shell=True, stdout=subprocess.PIPE)

When passing shell=True, the first argument is a string--the shell command line. When not using the shell, the first argument is a list. Both produce this:

print proc.communicate()
('hello world\n', None)