[Tutor] using subprocess to export files in bash

Rogelio scubacuda at gmail.com
Tue May 8 16:18:33 CEST 2012

While reading the subprocess documentation, I found a great example on
how to call commands with a PIPE


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]


How do I do this and output to a file?


output = "dmesg | grep hda > log.txt'

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