AC(8) OpenBSD System Manager's Manual AC(8)NAME
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
Read connect time data from wtmp instead of the default file,
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
SEE ALSOlogin(1), wtmp(5), cron(8), init(8), newsyslog(8), sa(8)HISTORY
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