uptime - Tell how long the system has been running.
uptime gives a one line display of the following
information. 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
This is the same information contained in the header line
displayed by w(1).
/var/run/utmp information about who is currently
/proc process information
uptime was written by Larry Greenfield
Please send bug reports to
ps(1), top(1), utmp(5),