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CentOS 7.0 - man page for ac (centos section 1)

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AC(1)											    AC(1)

       ac -  print statistics about users' connect time

       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 ]

       ac  prints out a report of connect time (in hours) based on the logins/logouts in the cur-
       rent wtmp file.	A total is also printed out.

       The accounting file wtmp is maintained by init(8) and login(1).	Neither ac nor login cre-
       ates 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 oth-
       er systems.  Use the command info accounting to get additional information.

       -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.
	      When  the wtmp file has a problem (a time-warp, missing record, or whatever), print
	      out an appropriate error.
	      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.*
	      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), in-
	      clude  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  com-
	      patibility, include this flag.*
	      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.*
	      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
       --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  pro-
	      gram  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.
	      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.
	      The system wide login record file. See wtmp(5) for further details.
       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>.
       login(1), wtmp(5), init(8), sa(8)

					  2010 August 16				    AC(1)
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