How to run a dos command in win7 console by newlisp

[lyl]

I want to run the dos command in win7 console by newlisp "exec" to clear secreen like this:

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(exec "cls")

but fails with a feedback ("\f").
Why? And how to deal with this?

PS: Also

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 (exec "color 0b") 

does not work.

[ralph.ronnquist]

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.:

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(! "cls")
(! "color 0b")

Alternatively at the interactive prompt, you can type the commands without parentheses and quoting by starting with the exclamation mark

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> !cls
> !color 0b

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

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(map println (exec "cls"))
(map println (exec "color 0b"))

Though, I don't use windows, so YMMV.

[lyl]

Perfect explanation！ I learn a lot. Many thanks！