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

FAILLOG(8)			    System Management Commands			       FAILLOG(8)

       faillog - display faillog records or set login failure limits

       faillog [options]

       faillog displays the contents of the failure log database (/var/log/faillog). It can also
       set the failure counters and limits. When faillog is run without arguments, it only
       displays the faillog records of the users who had a login failure.

       The options which apply to the faillog command are:

       -a, --all
	   Display (or act on) faillog records for all users having an entry in the faillog

	   The range of users can be restricted with the -u option.

	   In display mode, this is still restricted to existing users but forces the display of
	   the faillog entries even if they are empty.

	   With the -l, -m, -r, -t options, the users' records are changed, even if the user does
	   not exist on the system. This is useful to reset records of users that have been
	   deleted or to set a policy in advance for a range of users.

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

       -l, --lock-secs SEC
	   Lock account for SEC seconds after failed login.

	   Write access to /var/log/faillog is required for this option.

       -m, --maximum MAX
	   Set the maximum number of login failures after the account is disabled to MAX.

	   Selecting a MAX value of 0 has the effect of not placing a limit on the number of
	   failed logins.

	   The maximum failure count should always be 0 for root to prevent a denial of services
	   attack against the system.

	   Write access to /var/log/faillog is required for this option.

       -r, --reset
	   Reset the counters of login failures.

	   Write access to /var/log/faillog is required for this option.

       -t, --time DAYS
	   Display faillog records more recent than DAYS.

       -u, --user LOGIN|RANGE
	   Display faillog record or maintains failure counters and limits (if used with -l, -m
	   or -r options) only for 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-).

       When none of the -l, -m, or -r options are used, faillog displays the faillog record of
       the specified user(s).

       faillog only prints out users with no successful login since the last failure. To print
       out a user who has had a successful login since their last failure, you must explicitly
       request the user with the -u flag, or print out all users with the -a flag.

	   Failure logging file.

       login(1), faillog(5).

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

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