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Message: [QUOTE="Kushal Kumaran, post: 4053745"] First, the output of "time" is not actually garbage. It probably has all the information you need. Second, when you run "time" from the terminal, you are probably invoking the version of "time" built in to your shell. You can try explicitly running /usr/bin/time (probably, could be /bin/time or something else) to get the output you're seeing from your program. Passing shell=True to subprocess.Popen invokes a shell to run your command. You will also need to pass executable="path-to-your-shell" for exact results. That should give you the same output as you get from a terminal. You will probably need to change the "cmd" arg to be a string. [/QUOTE]