I'm not exactly sure what you mean by "change the prompt." If you simply need to send command line arguments to the programs you're executing, you can do that both with system (but note the differences between specifying the command as a string vs. as a list) or with backticks. If you need to interact with the program and respond to its prompts for information, it's probably a job for Expect.

In reply to Re: Interacting with a child process by friedo
in thread Interacting with a child process by K_M_McMahon

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