Wtmptail is tail for the wtmp-file in a human readable format. The wtmp-file contains information (accounting) on users that have logged-in and out.
(AIX 5.3 binary)
(.spec file for building wtmptail on AIX yourself)
wtmptail nicely runs in a
window (in which it can be filtered, merged, and much more).
two tools somewhat related are yawho and whowatch:
fixed a possible segfault (Linux)
small wtmp files made wtmptail exit with an error. improved man-page.