Tell how long the system has been running.
uptime [ options ]
uptime gives a one line display of the following information. The current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.
This is the same information contained in the header line displayed by w(1).
System load averages is the average number of processes that are either in a runnable or uninterruptable state. A process in a runnable state is either using the CPU or waiting to use the CPU. A process in uninterruptable state is waiting for some I/O access, eg waiting for disk. The averages are taken over the three time intervals. Load averages are not normalized for the number of CPUs in a system, so a load average of 1 means a single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time.
-p , --pretty show uptime in pretty format
-h , --help display this help text
-s , --since system up since, in yyyy-mm-dd HH:MM:SS format
-V , --version display version information and exit
/var/run/utmp information about who is currently logged on
/proc process information
uptime was written by greenfie@gauss. rutgers. edu Larry Greenfield and johnsonm@sunsite. unc. edu Michael K. Johnson
Please send bug reports to email@example.com