How exactly you are using utmp ? locate on my local Fedora produces :
Quote:
locate utmp
/usr/bin/utmpdump
/usr/include/utmp.h
/usr/include/utmpx.h
/usr/include/bits/utmp.h
/usr/include/bits/utmpx.h
/usr/sbin/dump-utmp
/usr/share/doc/vte-0.14.2/utmpwtmp.txt
/usr/share/dstat/dstat_utmp.py
/usr/share/dstat/dstat_utmp.pyc
/usr/share/man/en/man5/utmp.5.gz
/usr/share/man/man0p/utmpx.h.0p.gz
/usr/share/man/man3/utmpname.3.gz
/usr/share/man/man5/utmp.5.gz
/var/run/utmp
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Which one you are using and how ? Why not use "finger" "last" "who" ?