ac man page on OpenBSD

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AC(8)			OpenBSD System Manager's Manual			 AC(8)

     ac - connect time accounting

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

     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.  ac
     examines these records and writes the accumulated connect time 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

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

     user ...
	     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(5).

     The default wtmp file will increase without bound unless it is truncated.
     It is normally truncated by newsyslog(8), which renames and rotates the
     wtmp files every week.  In order for ac to run in sync with the rotation
     of wtmp, newsyslog(8) is configured to run just after ac completes.

     User accounting information can be mailed weekly to the system
     administrator: see weekly(8) for more information.	 No login or connect
     time accounting is performed if /var/log/wtmp does not exist.

     /var/log/wtmp	    connect time accounting file
     /var/log/wtmp.[0-7]    rotated files

     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), wtmp(5), cron(8), init(8), newsyslog(8), sa(8)

     An ac command appeared in Version 6 AT&T UNIX.  This version of ac was
     written for NetBSD 0.9a from the specification provided by various
     systems' manual pages.

OpenBSD 4.9		       September 3, 2010		   OpenBSD 4.9

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