Linux uptime

The uptime command tells us how long a system has been running.

Syntax:

Look at the above snapshot, command "uptime" displays output in one line.

From the left, it shows,

• currrent system time
• duration for which system has been running (system is running since 18 minutes)
• number of users logged in (2 users are logged in)
• system load average CPU load for past 1, 5 and 15 minutes.

Here, system load averages are the processes which are either in runnable or in uninterruptable state.

A runnable process may be either a running one using CPU or waiting to use CPU. An uninterruptable process is waiting for some I/O access.

Option

Command uptime has a single option.

Uptime -V

It displays version information.