connect time accounting
If the file /var/log/wtmp exists, a record
of individual login and logout times are written to it by
ac examines these
records and writes the accumulated connect time for all logins to the
The options are as follows:
- Display the connect times in 24 hour chunks.
- Print individual users' totals.
- 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
-tflags may be specified.
- Read connect time data from wtmp instead of the default file, /var/log/wtmp.
- 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
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
newsyslog(8) is configured to run just after
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.
- connect time accounting file
- rotated files
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 other:
$ ac -p -t "ttyd*" > modems $ ac -p -t "!ttyd*" > other
login(1), wtmp(5), cron(8), init(8), newsyslog(8), sa(8)
ac command appeared in
Version 5 AT&T UNIX. This version of
ac was written for NetBSD
0.9A from the specification provided by various systems' manual