Display status of processes (programs) running in the system.
Note that unlike other commands, ps options do not have a - prefix.
a displays processes of other users.
f displays a family tree of processes.
j displays output using jobs format.
l displays in long format, with many details for each process.
m displays memory usage information for each process.
u displays the user name and start time.
x displays processes that are not associated with any terminal.
The ps command displays the status of processes running in the system. Typing ps alone produces a list of processes you are running. To see a list of all processes in the system, type ps ax (or ps aux, if you want more details about each process).