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OpenDarwin 7.2.1 - man page for ac (opendarwin section 8)

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AC(8)				   BSD System Manager's Manual				    AC(8)

NAME
     ac -- display connect time accounting

SYNOPSIS
     ac [-d] [-p] [-w file] [users ...]

DESCRIPTION
     If the file /var/log/wtmp exists, a record of individual login and logout times are written
     to it by init(8) and login(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.

     -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 keeping about a weeks worth on hand).  No login times
     are collected however, if the file does not exist.

FILES
     /var/log/wtmp
     /var/log/wtmp.[0-7]  rotated files

SEE ALSO
     init(8), sa(8), login(1), utmp(5).

HISTORY
     A ac command appeared in Version 6 AT&T UNIX.

4th Berkeley Distribution		  April 19, 1994		4th Berkeley Distribution
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