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CentOS 7.0 - man page for uptime (centos section 1)

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UPTIME(1)				  User Commands 				UPTIME(1)

NAME
       uptime - Tell how long the system has been running.

SYNOPSIS
       uptime [options]

DESCRIPTION
       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 sin-
       gle CPU system is loaded all the time while on a 4 CPU system it means it was idle 75%  of
       the time.

OPTIONS
       -p, --pretty
	      show uptime in pretty format

       -h, --help
	      display this help text

       -s, --since
	      system up since, in yyyy-mm-dd MM:HH:SS format

       -V, --version
	      display version information and exit

FILES
       /var/run/utmp
	      information about who is currently logged on

       /proc  process information

AUTHORS
       uptime was written by Larry Greenfield <greenfie@gauss.rutgers.edu> and Michael K. Johnson
       <johnsonm@sunsite.unc.edu>

SEE ALSO
       ps(1), top(1), utmp(5), w(1)

REPORTING BUGS
       Please send bug reports to <procps@freelists.org>

procps-ng				  December 2012 				UPTIME(1)
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