[Replacing shell pipeline] #python

snippets.py

# Replacing shell pipeline
# output=`dmesg | grep hda`
# becomes:

p1 = Popen(["dmesg"], stdout=PIPE)
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
p1.stdout.close()  # Allow p1 to receive a SIGPIPE if p2 exits.
output = p2.communicate()[0]

#Alternatively:
# output=`dmesg | grep hda`
# becomes:

output=check_output("dmesg | grep hda", shell=True)