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AC(1)                                                                    AC(1)



NAME
       ac -  print statistics about users' connect time

SYNOPSIS
       ac     [ -d | --daily-totals ] [ -y | --print-year ]
              [ -p | --individual-totals ] [ people ]
              [ -f | --file filename ] [ -a | --all-days ]
              [ --complain ] [ --reboots ] [ --supplants ]
              [ --timewarps ] [ --compatibility ]
              [ --tw-leniency num ] [ --tw-suspicious num ]
              [ -z | --print-zeros ] [ --debug ]
              [ -V | --version ] [ -h | --help ]

DESCRIPTION
       ac  prints out a report of connect time (in hours) based on the logins/logouts in the current wtmp file.  A to-
       tal is also printed out.

       The accounting file wtmp is maintained by init(8) and login(1).  Neither ac nor login creates the  wtmp  if  it
       doesn't exist, no accounting is done.  To begin accounting, create the file with a length of zero.

       NOTE:  The wtmp file can get really big, really fast.  You might want to trim it every once and a while.

       GNU ac works nearly the same u*x ac, though it's a little smarter in several ways.  You should therefore expect
       differences in the output of GNU ac and the output of ac's on other systems.  Use the command  info  accounting
       to get additional information.

OPTIONS
       -d, --daily-totals
              Print totals for each day rather than just one big total at the end.  The output looks like this:
                      Jul  3  total     1.17
                      Jul  4  total     2.10
                      Jul  5  total     8.23
                      Jul  6  total     2.10
                      Jul  7  total     0.30

       -p, --individual-totals
              Print  time  totals  for  each user in addition to the usual everything-lumped-into-one value.  It looks
              like:
                      bob       8.06
                      goff      0.60
                      maley     7.37
                      root      0.12
                      total    16.15

       people Print out the sum total of the connect time used by all of the users included in people.  Note that peo-
              ple is a space separated list of valid user names; wildcards are not allowed.

       -f, --file filename
              Read from the file filename instead of the system's wtmp file.

       --complain
              When  the  wtmp  file has a problem (a time-warp, missing record, or whatever), print out an appropriate
              error.

       --reboots
              Reboot records are NOT written at the time of a reboot, but when the system restarts; therefore,  it  is
              impossible  to know exactly when the reboot occurred.  Users may have been logged into the system at the
              time of the reboot, and many ac's automatically count the time between the login and the  reboot  record
              against  the  user (even though all of that time shouldn't be, perhaps, if the system is down for a long
              time, for instance).  If you want to count this time, include the flag.  *For vanilla ac  compatibility,
              include this flag.*

       --supplants
              Sometimes,  a  logout  record is not written for a specific terminal, so the time that the last user ac-
              crued cannot be calculated.  If you want to include the time from the user's login to the next login  on
              the  terminal (though probably incorrect), include this you want to include the time from the user's lo-
              gin to the next login on the terminal (though probably incorrect), include this flag.  *For  vanilla  ac
              compatibility, include this flag.*

       --timewarps
              Sometimes,  entries  in  a wtmp file will suddenly jump back into the past without a clock change record
              occurring.  It is impossible to know how long a user was logged in when this occurs.   If  you  want  to
              count the time between the login and the time warp against the user, include this flag.  *For vanilla ac
              compatibility, include this flag.*

       --compatibility
              This is shorthand for typing out the three above options.

       -a, --all-days
              If we're printing daily totals, print a record for every day instead of skipping intervening days  where
              there  is  no login activity.  Without this flag, time accrued during those intervening days gets listed
              under the next day where there is login activity.

       --tw-leniency num
              Set the time warp leniency to num seconds.  Records in wtmp files might be slightly out of  order  (most
              notably  when  two logins occur within a one-second period - the second one gets written first).  By de-
              fault, this value is set to 60.  If the program notices this problem, time is not assigned to users  un-
              less the --timewarps flag is used.

       --tw-suspicious num
              Set  the  time  warp  suspicious value to num seconds.  If two records in the wtmp file are farther than
              this number of seconds apart, there is a problem with the wtmp file (or your machine hasn't been used in
              a year).  If the program notices this problem, time is not assigned to users unless the --timewarps flag
              is used.

       -y, --print-year
              Print year when displaying dates.

       -z, --print-zeros
              If a total for any category (save the grand total) is zero, print it.  The default is to suppress print-
              ing.

       --debug
              Print verbose internal information.

       -V, --version
              Print the version number of ac to standard output and quit.

       -h, --help
              Prints the usage string and default locations of system files to standard output and exits.

FILES
       wtmp
              The system wide login record file. See wtmp(5) for further details.



AUTHOR
       The  GNU  accounting  utilities were written by Noel Cragg <noelATgnu.edu>. The man page was adapted from
       the accounting texinfo page by Susan Kleinmann <sgkATsgk.net>.

SEE ALSO
       login(1), wtmp(5), init(8), sa(8)



                                1995 October 31                          AC(1)