ac(8) [netbsd man page]

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

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
     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 sched-
     uled 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.

FILES

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

SEE ALSO

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

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 sys-
     tems' manual pages.

BSD
								  April 19, 1994							       BSD

LAST,LASTB(1)						Linux System Administrator's Manual					     LAST,LASTB(1)

NAME

       last, lastb - show listing of last logged in users

SYNOPSIS

       last [-R] [-num] [ -n num ] [-adFiowx] [ -f file ] [ -t YYYYMMDDHHMMSS ] [name...]  [tty...]
       lastb [-R] [-num] [ -n num ] [ -f file ] [-adFiowx] [name...]  [tty...]

DESCRIPTION

       Last  searches  back through the file /var/log/wtmp (or the file designated by the -f flag) and displays a list of all users logged in (and
       out) since that file was created.  Names of users and tty's can be given, in which case last will show  only  those  entries  matching  the
       arguments.  Names of ttys can be abbreviated, thus last 0 is the same as last tty0.

       When  last catches a SIGINT signal (generated by the interrupt key, usually control-C) or a SIGQUIT signal (generated by the quit key, usu-
       ally control-), last will show how far it has searched through the file; in the case of the SIGINT signal last will then terminate.

       The pseudo user reboot logs in each time the system is rebooted.  Thus last reboot will show a log of all reboots since the  log  file  was
       created.

       Lastb is the same as last, except that by default it shows a log of the file /var/log/btmp, which contains all the bad login attempts.

OPTIONS

       -f file
	      Tells last to use a specific file instead of /var/log/wtmp.

       -num   This is a count telling last how many lines to show.

       -n num The same.

       -t YYYYMMDDHHMMSS
	      Display  the  state of logins as of the specified time.  This is useful, e.g., to determine easily who was logged in at a particular
	      time -- specify that time with -t and look for "still logged in".

       -f file
	      Specifies a file to search other than /var/log/wtmp.

       -R     Suppresses the display of the hostname field.

       -a     Display the hostname in the last column. Useful in combination with the next flag.

       -d     For non-local logins, Linux stores not only the host name of the remote host but its IP number as well. This option  translates  the
	      IP number back into a hostname.

       -F     Print full login and logout times and dates.

       -i     This option is like -d in that it displays the IP number of the remote host, but it displays the IP number in numbers-and-dots nota-
	      tion.

       -o     Read an old-type wtmp file (written by linux-libc5 applications).

       -w     Display full user and domain names in the output.

       -x     Display the system shutdown entries and run level changes.

NOTES

       The files wtmp and btmp might not be found. The system only logs information in these files if they are present. This is a local configura-
       tion issue. If you want the files to be used, they can be created with a simple touch(1) command (for example, touch /var/log/wtmp).

FILES

       /var/log/wtmp
       /var/log/btmp

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

SEE ALSO

       shutdown(8), login(1), init(8)

								   Jul 31, 2004 						     LAST,LASTB(1)