uptime — stdin stdout - file -- opt --help --version
uptime command tells
you how long the system has been running since the last
$ uptime 10:54pm up 8 days, 3:44, 3 users, load average: 0.89, 1.00, 2.15
This information is, from left to right: the current time (10:54pm), system uptime (8 days, 3 hours, 44 minutes), number of users logged in (3), and system load average for three time periods: one minute (0.89), five minutes (1.00), and fifteen minutes (2.15). The load average is the average number of processes ready to run in that time interval.