uptime

uptime gives a one line display of the following information:

$ uptime
 06:00:56 up  2:15,  1 user,  load average: 0.01, 0.03, 0.05

where:

06:00:56 is the current time on the system
up is state of the system
2:15 (2 hours and 15 minutes) is the total time for which the system has been up
1 user is the number of user sessions open
load average: 0.01, 0.03, 0.05 is system load averages for the past 1, 5, and 15 minutes correspondigly

-p shows only the system up time in pretty format:

$ uptime -p
up 3 hours, 19 minutes

-s displays the date and time since the system has been running:

$ uptime -s
2018-05-20 03:45:55

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