NAME
wtmp - user login history
DESCRIPTION
This file records all logins and logouts. Its format is
exactly like utmp (V) except that a null user name indicates
a logout on the associated typewriter. Furthermore, the
typewriter name `~' indicates that the system was rebooted
at the indicated time; the adjacent pair of entries with
typewriter names `|' and `}' indicate the system-maintained
time just before and just after a date command has changed
the system's idea of the time.
Wtmp is maintained by login (I) and init (VIII). Neither of
these programs creates the file, so if it is removed
record-keeping is turned off. It is summarized by ac
(VIII).
FILES
/usr/adm/wtmp
SEE ALSO
utmp (V), login (I), init (VIII), ac (VIII), who (I)
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