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Linux 2.6 - man page for lastlog (linux section 8)

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LASTLOG(8)			    System Management Commands			       LASTLOG(8)

NAME
       lastlog - reports the most recent login of all users or of a given user

SYNOPSIS
       lastlog [options]

DESCRIPTION
       lastlog formats and prints the contents of the last login log /var/log/lastlog file. The
       login-name, port, and last login time will be printed. The default (no flags) causes
       lastlog entries to be printed, sorted by their order in /etc/passwd.

OPTIONS
       The options which apply to the lastlog command are:

       -b, --before DAYS
	   Print only lastlog records older than DAYS.

       -h, --help
	   Display help message and exit.

       -t, --time DAYS
	   Print the lastlog records more recent than DAYS.

       -u, --user LOGIN|RANGE
	   Print the lastlog record of the specified user(s).

	   The users can be specified by a login name, a numerical user ID, or a RANGE of users.
	   This RANGE of users can be specified with a min and max values (UID_MIN-UID_MAX), a
	   max value (-UID_MAX), or a min value (UID_MIN-).

       If the user has never logged in the message ** Never logged in** will be displayed instead
       of the port and time.

       Only the entries for the current users of the system will be displayed. Other entries may
       exist for users that were deleted previously.

NOTE
       The lastlog file is a database which contains info on the last login of each user. You
       should not rotate it. It is a sparse file, so its size on the disk is usually much smaller
       than the one shown by "ls -l" (which can indicate a really big file if you have in passwd
       users with a high UID). You can display its real size with "ls -s".

FILES
       /var/log/lastlog
	   Database times of previous user logins.

CAVEATS
       Large gaps in UID numbers will cause the lastlog program to run longer with no output to
       the screen (i.e. if in lastlog database there is no entries for users with UID between 170
       and 800 lastlog will appear to hang as it processes entries with UIDs 171-799).

System Management Commands		    06/24/2011				       LASTLOG(8)
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