NAME
ac —
display connect time
accounting
SYNOPSIS
ac |
[-d | -p]
[-t tty]
[-w file]
[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 program
ac examines these records and writes the accumulated connect
time for all logins to the standard output.
Options available:
-
-
- -d
- Display the connect times in 24 hour chunks.
-
-
- -p
- Display individual user 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
file
- Read raw connect time data from file
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 amount of
login time for all active accounts on the system.
The default
wtmp file is an infinitely increasing file unless
frequently truncated. This is normally done by the daily daemon scripts
scheduled by
cron(8), which rename
and rotate the
wtmp files before truncating them (and keep
about a week's worth on hand). No login times are collected, however, if the
file 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
- /var/log/wtmp.[0-7]
- rotated files
EXIT STATUS
The
ac utility exits 0 on success, and >0 if an
error occurs.
SEE ALSO
login(1),
utmp(5),
init(8),
sa(8)
HISTORY
An
ac command appeared in
Version 6
AT&T UNIX. This version of
ac was written for
NetBSD 1.0 from the specification provided by various
systems' manual pages.