python process capture stdout code example
Example 1: python run command and read output
import subprocess, sys
cmd = "/usr/sbin/netstat -p tcp -f inet"
p = subprocess.Popen(cmd, shell=True, stderr=subprocess.PIPE)
while True:
out = p.stderr.read(1)
if out == '' and p.poll() != None:
break
if out != '':
sys.stdout.write(out)
sys.stdout.flush()
Example 2: python write subprocess stdout stderr to file
with open("stdout.txt","wb") as out, open("stderr.txt","wb") as err:
subprocess.Popen("ls",stdout=out,stderr=err)