1. To display information about your processes that are currently running:
ps PID TTY TIME COMMAND 13185 ttyAF/ABFd 0:00 rlogind 13187 ttyAF/ABFd 0:01 bash 13218 ttyAF/ABFd 0:00 ps
This user currently has three active processes; the process associated with the ps command itself (13218); their current shell (13187) and a process associated with the remote login (13185) which indicates that they have logged in to their account on this system from another system.
2. To display information about all your processes (System V)
ps -u joanne PID TTY TIME COMMAND 13251 ttyAF/ABFd 0:00 ps 13187 ttyAF/ABFd 0:01 bash 18765 ? 0:08 xclock 3012 ? 0:00 bash 3015 ? 0:00 zmail.ne 3016 ? 4:03 zmail.bi 18465 ? 0:00 bash 18469 ? 0:34 xman
This user has several processes that are not associated with a controlling terminal. They can be identified by the ? (question mark) under the TTY column.
3. To display information about the processes associated with another user (System V)
ps -u rob PID TTY TIME COMMAND 1390 ttyAH/ABHb 0:18 bash 1403 ttyAH/ABHc 0:01 bash 1435 ttyAH/ABHY 0:01 bash 1471 ttyAH/ABHY 5:57 ream 2307 ttyAH/ABHb 0:29 xbiff 2315 ttyAH/ABHb 0:27 xbiff
The user rob is running three instances of the bash shell, a mail program known as ream and two biff utilities.