ac man page on MacOSX

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

     ac — display connect-time accounting

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

     A record of individual login and logout times are written to the system
     log by login(8) and launchd(8), respectively.  The program ac examines
     these records and writes the accumulated connect time (in decimal hours)
     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 system log.

     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.

     login(1), utmpx(5), launchd(8), sa(8)

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

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

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