Skip to content

Instantly share code, notes, and snippets.


rongyi/cmd function

Created Jun 19, 2017
What would you like to do?
# -*- coding: utf-8 -*-
import os
import sys
import shlex
import subprocess
import select
def run_cmd(cmd, live=False, readsize=10):
#readsize = 10
cmdargs = shlex.split(cmd)
p = subprocess.Popen(cmdargs, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout = ''
stderr = ''
rpipes = [p.stdout, p.stderr]
while True:
rfd, wfd, efd =, [], rpipes, 1)
if p.stdout in rfd:
dat =, readsize)
if live:
stdout += dat
if dat == '':
if p.stderr in rfd:
dat =, readsize)
stderr += dat
if live:
if dat == '':
# only break out if we've emptied the pipes, or there is nothing to
# read from and the process has finished.
if (not rpipes or not rfd) and p.poll() is not None:
# Calling wait while there are still pipes to read can cause a lock
elif not rpipes and p.poll() == None:
return p.returncode, stdout, stderr
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment