48 lines
1.4 KiB
Groff
48 lines
1.4 KiB
Groff
.\" -*-Nroff-*-
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.\"
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.TH UPTIME 1 "26 Jan 1993" "Cohesive Systems" "Linux User's Manual"
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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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.br
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.B uptime
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.RB [ \-V ]
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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.
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The current time,
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how long the system has been running,
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how many users are currently logged on,
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and the system load averages for the past 1, 5, and 15 minutes.
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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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.sp
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System load averages is the average number of processes that are either
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in a runnable or uninterruptable state. A process in a runnable state is
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either using the CPU or waiting to use the CPU. A process in
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uninterruptable state is waiting for some I/O access, eg waiting for
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disk. The averages are taken over the three time intervals.
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Load averages are not normalized for the number of CPUs in a system, so
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a load average of 1 means a single CPU system is loaded all the time
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while on a 4 CPU system it means it was idle 75% of the time.
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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 Larry Greenfield <greenfie@gauss.rutgers.edu> and
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Michael K. Johnson <johnsonm@sunsite.unc.edu>.
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Please send bug reports to <procps@freelists.org>
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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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