Corrected example "replacing shell pipe line".
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@ -354,7 +354,7 @@ Replacing older functions with the subprocess module
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output=`dmesg | grep hda`
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==>
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p1 = Popen(["dmesg"], stdout=PIPE)
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p2 = Popen(["grep", "hda"], stdin=p1.stdout)
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p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
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output = p2.communicate()[0]
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