65 lines
1.7 KiB
Groff
65 lines
1.7 KiB
Groff
.\" -*-Nroff-*-
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.\"
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.TH UPTIME "1" "December 2012" "procps-ng" "User Commands"
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.SH NAME
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uptime \- Tell how long the system has been running.
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.SH SYNOPSIS
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.B uptime
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[\fIoptions\fR]
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.SH DESCRIPTION
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.B uptime
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gives a one line display of the following information. The current time, how
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long the system has been running, how many users are currently logged on, and
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the system load averages for the past 1, 5, and 15 minutes.
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.PP
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This is the same information contained in the header line displayed by
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.BR w (1).
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.PP
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System load averages is the average number of processes that are either in a
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runnable or uninterruptable state. A process in a runnable state is either
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using the CPU or waiting to use the CPU. A process in uninterruptable state
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is waiting for some I/O access, eg waiting for disk. The averages are taken
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over the three time intervals. Load averages are not normalized for the
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number of CPUs in a system, so a load average of 1 means a single CPU system
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is loaded all the time while on a 4 CPU system it means it was idle 75% of
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the time.
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.SH OPTIONS
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.TP
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\fB\-p\fR, \fB\-\-pretty\fR
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show uptime in pretty format
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.TP
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\fB\-h\fR, \fB\-\-help\fR
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display this help text
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.TP
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\fB\-s\fR, \fB\-\-since\fR
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system up since, in yyyy-mm-dd MM:HH:SS format
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.TP
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\fB\-V\fR, \fB\-\-version\fR
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display version information and exit
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.SH FILES
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.TP
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.I /var/run/utmp
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information about who is currently logged on
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.TP
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.I /proc
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process information
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.SH AUTHORS
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.B uptime
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was written by
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.UR greenfie@gauss.\:rutgers.\:edu
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Larry Greenfield
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.UE
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and
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.UR johnsonm@sunsite.\:unc.\:edu
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Michael K. Johnson
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.UE
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.SH "SEE ALSO"
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.BR ps (1),
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.BR top (1),
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.BR utmp (5),
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.BR w (1)
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.SH "REPORTING BUGS"
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Please send bug reports to
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.UR procps@freelists.org
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.UE
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