gistfile1.txt

#!/usr/bin/env python

from datetime import datetime
import subprocess

cmd = 'vmstat 10'

proc = subprocess.Popen(cmd, stdin=subprocess.PIPE,
                        stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
                        close_fds=True, shell=True)
proc.stdin.close()


for line in iter(proc.stdout.readline, ''):
    line = line.rstrip()

    print "%s: %s" % (datetime.now(), line)