uptime Command
Purpose
Shows the length of the time that the system is up.
Syntax
uptimeDescription
The uptime command prints the current time, length of time the system is up, number of users who are online, and the load average. The load average is the number of runnable threads that are both running and waiting for CPU and thread from newly started processes over the preceding 1-, 5-, and 15-minute intervals. The output of the uptime command is, essentially, the heading line that is provided by the w command.