uptime Man page

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 cur‐
rent 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 unin‐
terruptable 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 aver‐
age 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.

OPTIONS

-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

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)