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### 17.1.3.2 Replacing shell pipe line

    output=`dmesg | grep hda`
    ==>
    p1 = Popen(["dmesg"], stdout=PIPE)
    p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
    output = p2.communicate()[0]

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Release 2.5.4, documentation updated on 23rd December, 2008.