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RedHat 9 (Linux i386) - man page for who (redhat section 1)

WHO(1)									FSF								    WHO(1)

who - show who is logged on
who [OPTION]... [ FILE | ARG1 ARG2 ]
-a, --all same as -b -d --login -p -r -t -T -u -b, --boot time of last system boot -d, --dead print dead processes -H, --heading print line of column headings -i, --idle add idle time as HOURS:MINUTES, . or old (deprecated, use -u) --login print system login processes (equivalent to SUS -l) -l, --lookup attempt to canonicalize hostnames via DNS (-l is deprecated, use --lookup) -m only hostname and user associated with stdin -p, --process print active processes spawned by init -q, --count all login names and number of users logged on -r, --runlevel print current runlevel -s, --short print only name, line, and time (default) -t, --time print last system clock change -T, -w, --mesg add user's message status as +, - or ? -u, --users list users logged in --message same as -T --writable same as -T --help display this help and exit --version output version information and exit If FILE is not specified, use /var/run/utmp. /var/log/wtmp as FILE is common. If ARG1 ARG2 given, -m presumed: `am i' or `mom likes' are usual.
Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.
Report bugs to <>.
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE.
The full documentation for who is maintained as a Texinfo manual. If the info and who programs are properly installed at your site, the command info who should give you access to the complete manual. who (coreutils) 4.5.3 February 2003 WHO(1)