Command Section
AC(8)                   FreeBSD System Manager's Manual                  AC(8)

     ac - connect time accounting

     ac [-dp] [-t tty] [-w wtmp] [users ...]

     If the file /var/log/utx.log exists, a record of individual login and
     logout times are written to it by login(1) and init(8), respectively.
     The ac utility examines these records and writes the accumulated connect
     time (in hours) for all logins to the standard output.

     The options are as follows:

     -d         Display the connect times in 24 hour chunks.

     -p         Print individual users' totals.

     -t tty     Only do accounting logins on certain ttys.  The tty
                specification can start with '!' to indicate not this tty and
                end with '*' to indicate all similarly named ttys.  Multiple
                -t flags may be specified.

     -w wtmp    Read connect time data from wtmp instead of the default file,

     users ...  Display totals for the given individuals only.

     If no arguments are given, ac displays the total connect time for all
     accounts with login sessions recorded in utx.log.

     The default utx.log file will increase without bound unless it is
     truncated.  It is normally truncated by the daily scripts run by cron(8),
     which rename and rotate the utx.log files, keeping a week's worth of data
     on hand.  No login or connect time accounting is performed if
     /var/log/utx.log does not exist.

     /var/log/utx.log  connect time accounting file

     The ac utility exits 0 on success, and >0 if an error occurs.

     Allow times recorded in modems to be charged out at a different rate than

           ac -p -t "ttyd*" > modems
           ac -p -t "!ttyd*" > other

     login(1), getutxent(3), init(8), sa(8)

FreeBSD 11.1-RELEASE-p4        January 21, 2010        FreeBSD 11.1-RELEASE-p4
Command Section