Extraido del manual de w:
Código:
w displays information about the users currently on the machine, and
their processes. The header shows, in this order, the current time,
how long the system has been running, how many users are currently
logged on, and the system load averages for the past 1, 5, and 15 min-
utes.
Definitivamente necesitas aprender a usar el comando "man".