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FreeBSD 11.0 - man page for uptime (freebsd section 1)

UPTIME(1)						    BSD General Commands Manual 						 UPTIME(1)

NAME
uptime -- show how long system has been running
SYNOPSIS
uptime
DESCRIPTION
The uptime utility displays the current time, the length of time the system has been up, the number of users, and the load average of the system over the last 1, 5, and 15 minutes.
FILES
/boot/kernel/kernel system name list
SEE ALSO
w(1)
HISTORY
The uptime command appeared in 3.0BSD.
BSD
April 18, 1994 BSD