ac man page on 4.4BSD

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

     ac — display connect time accounting

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

     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 pro‐
     gram 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

     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.

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

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

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

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

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