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Constants
---------
DEVNULL: Special value that indicates that os.devnull should be used
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Older API
=========
call(...): Runs a command, waits for it to complete, then returns
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executable: A replacement program to execute.
stdin, stdout and stderr: These specify the executed programs' standard
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preexec_fn: (POSIX only) An object to be called in the child process
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close_fds: Controls closing or inheriting of file descriptors.
shell: If true, the command will be executed through the shell.
cwd: Sets the current directory before the child is executed.
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text: If true, decode stdin, stdout and stderr using the given encoding
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