04-15-2009
Doing it without using who would be difficult. Just capture the output of who. Exactly how to do that would depend on what language you're using.
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USERS(1) User Commands USERS(1)
NAME
users - print the user names of users currently logged in to the current host
SYNOPSIS
users [OPTION]... [FILE]
DESCRIPTION
Output who is currently logged in according to FILE. If FILE is not specified, use /var/run/utmp. /var/log/wtmp as FILE is common.
--help display this help and exit
--version
output version information and exit
AUTHOR
Written by Joseph Arceneaux and David MacKenzie.
REPORTING BUGS
Report users bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report users translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
The full documentation for users is maintained as a Texinfo manual. If the info and users programs are properly installed at your site,
the command
info coreutils 'users invocation'
should give you access to the complete manual.
GNU coreutils 8.5 February 2011 USERS(1)