Man Page copied from
ITTC (The Information and Telecommunication Technology Center) at the University of Kansas
LAST,LASTB(1)  Linux System Administrator's Manual  LAST,LASTB(1)

       last, lastb - show listing of last logged in users

       last [-R] [-num] [ -n num ] [-adiox] [ -f file ] [name...]
       lastb [-R] [-num]  [  -n	 num  ]	 [  -f	file  ]	 [-adiox]
       [name...]  [tty...]

       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 inter­
       rupt key, usually control-C) or a SIGQUIT  signal  (gener­
       ated  by	 the quit key, usually 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.

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

       -n num The same.

       -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.

       -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 notation.

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

       -x     Display  the  system shutdown entries and run level

       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 configuration 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).


       Miquel van Smoorenburg,

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

			   Jul 29, 1999		    LAST,LASTB(1)

Man Pages provided by:
Have you visited the forums?