Provided by: acct_6.5.1-1ubuntu1_i386 bug

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 total 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 people 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  acs  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  accrued  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 login 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 default, this value is set to  60.   If  the
              program  notices  this  problem,  time  is not assigned to users
              unless 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 printing.
       --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
       <noel@gnu.ai.mit.edu>.  The  man  page  was adapted from the accounting
       texinfo page by Susan Kleinmann <sgk@sgk.tiac.net>.

SEE ALSO

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

                                1995 October 31                          AC(1)