uptime
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 | This is the JargonFile (V4.47) entry for uptime - Next: urchin, Prev: upthread |
| :uptime: Technically, a machines time since last reboot; jargonically, how long a hacker has gone without sleep. "Whats your uptime?" "Oh, about 28 hours so far, but I think I can probably do another 12." This is, of course, a reference to the uptime command and the pride with which most Unix types note how long their computers go without reboots. Uptime is a testament to the stability of the OS and the stamina of the hacker. | |
| * (text is auto-included via JargonExtension by mutante using JargonFile VERSION 4.4.7, 29 DEC 2003 - JargonFile by Eric S. Raymond is in the public domain) | |
| Table of contents |
NAME
uptime - Tell how long the system has been running.SYNOPSIS
uptimeuptime [-V]
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.
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>.Please send bug reports to <albert@users.sf.net>
SEE ALSO
ps(1), top(1), utmp(5), w(1)
Index
Updated Time:: 13:57:05 GMT, October 14, 2008
