How to execute Python script from Java (via command line)?

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You cannot use the PIPE inside the Runtime.getRuntime().exec() as you do in your example. PIPE is part of the shell.

You could do either

  • Put your command to a shell script and execute that shell script with .exec() or

  • You can do something similar to the following

    String[] cmd = {
        "/bin/bash",
        "-c",
        "echo password | python script.py '" + packet.toString() + "'"
    };
Runtime.getRuntime().exec(cmd);

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