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 programac
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.
-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. -wfile- 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
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.