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I want to run the dos command in win7 console by newlisp "exec" to clear secreen like this: but fails with a feedback ("\f").
Why? And how to deal with this?

PS: Alsodoes not work.

Presumably the terminal control is done by writing control codes to stdout, and in that case you should rather use ! instead of exec. I.e.: Alternatively at the interactive prompt, you can type the commands without parentheses and quoting by starting with the exclamation mark The exec function runs a sub command and gathers its output lines into a list of strings, so to make this work with exec, you would need to print out those strings. Perhaps like this Though, I don't use windows, so YMMV.

Perfect explanation！ I learn a lot. Many thanks！