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is there a way using grep because though the above answers help me, we haven't covered it in class?
thank you.

---------- Post updated at 11:37 AM ---------- Previous update was at 11:36 AM...

thanks.

For the first 4 users only that are currently logged in output their effective user id.
It's not important the order in which each logged in i just want to have the top 4.

Same question as...

For the first 3 users only that are currently logged in output their effective user id.

thank you.