NAME
ac —
connect time accounting
SYNOPSIS
ac |
[-dp] [-t
tty] [-w
wtmp] [users ...] |
DESCRIPTION
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. Theac 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.
-ttty- 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. -wwtmp- Read connect time data from wtmp instead of the default file, /var/log/wtmp.
- 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.
FILES
- /var/log/wtmp
- connect time accounting file
EXIT STATUS
The ac utility exits 0 on success,
and >0 if an error occurs.