Run program from prompt repeatly.
 

Sometimes, I want to see excetuable program result from prompt repeatly.
Eg: # cat /proc/interrupts; sleep 1; cat /proc/interrupts

But I just can see one cycle by the command above.
I wonder if I can use sopme commands to run command repeatly.

See the manpages for watch(1).

That command does exactly what it says----ie it runs "cat", then "sleep", then "cat" again.

You need a loop--e.g.:
while true; do cat nums; sleep 1; done

In this example, "nums" is the name of a file on my machine.

I suggest going to tldp.org and getting the Bash Guide for Beginners, by Machtelt Garrels