Piping command using subprocess #subprocess #python

subprocess_piping_external_command.py

#!/bin/bin/env python
import subprocess


#Exeternal Command with args
DPKG = ['dpkg', '-l']
# Execute the command
dpkg_process = subprocess.Popen(DPKG, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
# Pipe output of dpkg to grep
grep_process = subprocess.Popen(['grep', 'lsof'], stdin=dpkg_process.stdout, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
# Wait till process to exit
out, error = grep_process.communicate()

# Get return status
rc = grep_process.returncode

# Get output data
cmd_out = out.splitlines()
for line in cmd_out:
  print(line.decode('utf-8'))