'who' command in Linux

Power user commands

Here is a brief overview of some other commands that you may find interesting at some point as you use Linux. They will help you to get all of the power out of Linux.

'who'

'who' is a command to find out who's working on your system. As you now know, Linux is a multi-user system. Even if you're using one computer at your home, you may be working as more than one person. For example, if you logged in as 'root' but are working as 'bob'. You may see something like this:

root	tty1	May 20 09:48
bob	tty2	May 20 10:05

This is just Linux's way of saying that 'root' started working on terminal 1 on May 20 at 9:48 in the morning and bob started working on terminal 2 at 10:05. This is mainly used in networked situations so the system administrator knows who's working. It can be used by your boss to find out that you've come in late too. You may use it to find out if you've opened more that one terminal so that you remember to log out.