UPTIME(1) User Commands June 2011

uptime - Tell how long the system has been running.

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 single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time.

OPTIONS

-h, --help
display this help text
-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

.UR [email protected]\:rutgers.\:edu

Larry Greenfield

.UE

and

.UR [email protected]\:unc.\:edu

Michael K. Johnson

.UE

SEE ALSO

ps(1),

top(1),

utmp(5),

w(1)

REPORTING BUGS

Please send bug reports to

.UR [email protected]

.UE