When you submit a command with shell=True, you submit the whole command as one string. Using shell=False (the default) will save you from having to start a new shell process (which is an expensive operation).
You can use shell=True, but you don't need to. ls and rmdir are not programs, they are internal commands within the shell program. I'm surprised you had any success running ls and rmdir without shell=True. You got "'STDOUT' is not defined" because you must either: from subprocess import STDOUT or you must refer to STDOUT as subprocess.STDOUT. P = Popen(cmd, shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE) But, the following seems to work fine with wget but with wget it seems to make errors whatever you do. This one is not good enough either: p = Popen(cmd, stdout=PIPE, stderr=PIPE) Python says: NameError: name 'STDOUT' is not defined There is error here: p = Popen(cmd, shell=True, stdin=PIPE, stdout=PIPE, stderr=STDOUT, close_fds=True) I just took my example from the Replacing os.popen* section in the docs. This looks like an interesting alternative. (Disclaimer: I wrote it.) They let you do some cool things. That way you wait for the output until the process has actually completed.Īlso, take a look at the Process objects in the cliutils package.
Here's a cleaner way: from subprocess import Popen, PIPE
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