Sys::Utmp provides a vaguely object oriented interface to the Unix
user accounting file ( usually /etc/utmp ). Whilst it would prefer
to use the getutent() function from the systems C libraries it will
attempt to provide its own if they are missing.

WWW: http://search.cpan.org/dist/Sys-Utmp/

--
Alexander Zhuravlev 
zaa@zaa.pp.ru