w

w [options] [user]

Print summaries of system usage, currently logged-in users, and what they are doing. w is essentially a combination of uptime, who, and ps -a. Display output for one user by specifying user.

Options

-h

Suppress headings and uptime information.

-l

Display in long format (the default).

-s

Display in short format.

-u

Print just the heading line. Equivalent to uptime. Solaris only.

-w

Same as -1. Solaris only.