09-27-2010
w reads a file - usually wtmpx. Those are not real processes, ie., if ps does not see them they became defunct and removed. Clearly, they were removed from the process table, but not cleaned up in the utmpx/wtmpx file.
A reboot will remove them, but I don't see what that gains on a production box, other than user complaints.
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WHO(1) FSF WHO(1)
NAME
who - show who is logged on
SYNOPSIS
who [OPTION]... [ FILE | ARG1 ARG2 ]
DESCRIPTION
-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.
AUTHOR
Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
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.
SEE ALSO
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)