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Constants
---------
DEVNULL: Special value that indicates that os.devnull should be used
PIPE: Special value that indicates a pipe should be created
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call(...): Runs a command, waits for it to complete, then returns
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>>> check_output(["ls", "-l", "/dev/null"])
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b'ls: non_existent_file: No such file or directory\n'
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>>> check_output(["sed", "-e", "s/foo/bar/"],
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(1, 'cat: /bin/junk: No such file or directory')
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