AC(1M)                                                     AC(1M)

          ac - login accounting

          ac [ -w wtmp ] [ -p ] [ -d ] [ people ] ...

          Ac produces a printout giving connect time for each user who
          has logged in during the life of the current wtmp file.  A
          total is also produced.  -w is used to specify an alternate
          wtmp file.  -p prints individual totals; without this
          option, only totals are printed.  -d causes a printout for
          each midnight to midnight period.  Any people will limit the
          printout to only the specified login names.  If no wtmp file
          is given, /usr/adm/wtmp is used.

          The accounting file /usr/adm/wtmp is maintained by init and
          login. Neither of these programs creates the file, so if it
          does not exist no connect-time accounting is done.  To start
          accounting, it should be created with length 0.  On the
          other hand if the file is left undisturbed it will grow
          without bound, so periodically any information desired
          should be collected and the file truncated.


          init(8), login(1), utmp(5).