repeating command on shell

Hi NG,

There was a nice standard linux shell command, which reapted a command
after itself every x seconds.

# repeat ifconfig

So ifconfig got repeated every second.

I know I could write a simple shell script, but why for, there exists a
tool like that already. But I can't remember and find that tool again.

Does anyone know the name of it?

Thanks a lot,

Achim

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