WTMP(V)                      2/22/74                      WTMP(V)


     wtmp - user login history


     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





     utmp (V), login (I), init (VIII), ac (VIII), who (I)