uptime

Show how long the system has been running

Print current time, uptime, number of logged-in users, and other information

$ uptime

Show only the amount of time the system has been booted for

$ uptime [[-p|--pretty]]

Print the date and time the system booted up at

$ uptime [[-s|--since]]

Display the time data in seconds

$ uptime [[-r|--raw]]

Display version

$ uptime [[-V|--version]]

uptime [options]

-p, --pretty
Show uptime in pretty format

-s, --since
Show when system started

uptime displays how long the system has been running, the number of logged-in users, and the system load averages for the past 1, 5, and 15 minutes.

Load averages include processes in uninterruptible sleep. Interpretation of load depends on number of CPUs.