06-30-2011
Quote:
Originally Posted by
Corona688
You can't login to them.
To be more precise: You can't login to them using a password.
What you still can is:
- root can use su to change to that user
- authorized users can use sudo (if installed) to change to that user
- if configured, users can login to that user using ssh with a public/private key
- the user can have cronjobs and run services
NP-users are best suited for running services.
LK-users can't have cronjobs and it is not possible to login to them with a public/private key.
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LEARN ABOUT REDHAT
faillog
FAILLOG(8) System Manager's Manual FAILLOG(8)
NAME
faillog - examine faillog and set login failure limits
SYNOPSIS
faillog [-u login-name] [-a] [-t days]
[-m max] [-pr]
DESCRIPTION
faillog formats the contents of the failure log, /var/log/faillog, and maintains failure counts and limits. The order of the arguments to
faillog is significant. Each argument is processed immediately in the order given.
The -p flag causes failure entries to be printed in UID order. Entering -u login-name flag will cause the failure record for login-name
only to be printed. Entering -t days will cause only the failures more recent than days to be printed. The -t flag overrides the use of
-u. The -a flag causes all users to be selected. When used with the -p flag, this option selects all users who have ever had a login
failure. It is meaningless with the -r flag.
The -r flag is used to reset the count of login failures. Write access to /var/log/faillog is required for this option. Entering -u
login-name will cause only the failure count for login-name to be reset.
The -m flag is used to set the maximum number of login failures before the account is disabled. Write access to /var/log/faillog is
required for this option. Entering -m max will cause all accounts to be disabled after max failed logins occur. This may be modified with
-u login-name to limit this function to login-name only. 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.
Options may be combined in virtually any fashion. Each -p, -r, and -m option will cause immediate execution using any -u or -t modifier.
CAVEATS
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.
Some systems may replace /var/log with /var/adm or /usr/adm.
FILES
/var/log/faillog - failure logging file
SEE ALSO
login(1), faillog(5)
AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com)
FAILLOG(8)