Hi, I'm new to shell scripting and i'm trying to write code which contains exactly three pipe commands (e.g. A | B | C) to return a list of the users currently logged into the system. I've been told three useful commands i could use are who, grep and cut. I know 'who' return a list of the users logged in with some information about them and a combination of the other two might be able to extract the exact user name. Can anyone help me out? Thanks.

btw im using ubuntu 11.10

I don't know why you will need grep.
What have you done so far?