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NetBSD 6.1.5 - man page for ac (netbsd section 8)

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

     ac -- display connect time accounting

     ac [-d | -p] [-t tty] [-w file] [users ...]

     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.

     The ac utility exits 0 on success, and >0 if a fatal error occurs.

     /var/log/wtmp	  connect time accounting file
     /var/log/wtmp.[0-7]  rotated files

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

     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.

BSD					  April 19, 1994				      BSD

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