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The ping utility was written by Mike Muuss in December 1983.
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ruptime(1c) [bsd man page]

RUPTIME(1C)															       RUPTIME(1C)

NAME
ruptime - show host status of local machines SYNOPSIS
ruptime [ -a ] [ -r ] [ -l ] [ -t ] [ -u ] DESCRIPTION
Ruptime gives a status line like uptime for each machine on the local network; these are formed from packets broadcast by each host on the network once a minute. Machines for which no status report has been received for 11 minutes are shown as being down. Users idle an hour or more are not counted unless the -a flag is given. Normally, the listing is sorted by host name. The -l , -t , and -u flags specify sorting by load average, uptime, and number of users, respectively. The -r flag reverses the sort order. FILES
/usr/spool/rwho/whod.* data files SEE ALSO
rwho(1C) 4.2 Berkeley Distribution April 29, 1985 RUPTIME(1C)

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ruptime(1)							   User Commands							ruptime(1)

NAME
ruptime - show host status of local machines SYNOPSIS
ruptime [-ar] [-l | -t | -u] DESCRIPTION
The ruptime utility gives a status line like uptime (see uptime(1)) for each machine on the local network; these are formed from packets broadcast by each host on the network approximately every three minutes. Machines for which no status report has been received for 11 minutes are shown as being down. Normally, the listing is sorted by host name, but this order can be changed by specifying one of the options listed below. OPTIONS
The following options are supported: -a Counts even those users who have been idle for an hour or more. -r Reverses the sorting order. -l | -t | -u These options are mutually exclusive. The use of one overrides the previous one(s). -l Sorts the display by load average. -t Sorts the display by up time. -u Sorts the display by number of users. FILES
/var/spool/rwho/whod.* data files ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWrcmdc | +-----------------------------+-----------------------------+ SEE ALSO
uptime(1), rwho(1), in.rwhod(1M), attributes(5) SunOS 5.10 6 Nov 2000 ruptime(1)

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