FreeBSD 7.0 manual page repository

FreeBSD is a free computer operating system based on BSD UNIX originally. Many IT companies, like DeployIS is using it to provide an up-to-date, stable operating system.

ac - connect time accounting



      ac - connect time accounting


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


      If the file /var/log/wtmp 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 specifica‐
                 tion 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 wtmp.
      The default wtmp 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 wtmp files, keeping a week’s worth of data on hand.
      No login or connect time accounting is performed if /var/log/wtmp does
      not exist.
      For example,
      ac -p -t "ttyd*" > modems
      ac -p -t "!ttyd*" > other
      allows times recorded in modems to be charged out at a different rate
      than other.


      /var/log/wtmp  connect time accounting file
      The ac utility exits 0 on success, and >0 if an error occurs.
      login(1), utmp(5), init(8), sa(8)


Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.