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UPTIME

Section: User Commands (1)
Updated: December 2012
Index Return to Main Contents
 

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

-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 and Michael K. Johnson  

SEE ALSO

ps(1), top(1), utmp(5), w(1)  

REPORTING BUGS

Please send bug reports to


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
FILES
AUTHORS
SEE ALSO
REPORTING BUGS


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