Интерактивная система просмотра системных руководств (man-ов)
ac (8)
ac (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
>> ac (8) ( FreeBSD man: Команды системного администрирования )
BSD mandoc
NAME
ac
- connect time accounting
SYNOPSIS
[-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.
The
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.
-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 specified.
-w wtmp
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,
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
