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. 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
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.
The default wtmp file will increase without bound unless it
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
$ ac -p -t "ttyd*" > modems
$ ac -p -t "!ttyd*" > other
allows times recorded in modems to be charged out at a different rate
The ac utility exits 0 on success or >0 if a fatal error occurred.
/var/log/wtmp connect time accounting file
/var/log/wtmp.[0-7] rotated files
login(1), utmp(5), init(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
OpenBSD 3.6 March 15, 1994
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