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Linux 2.6 - man page for chage (linux section 1)

CHAGE(1)				  User Commands 				 CHAGE(1)

NAME
       chage - change user password expiry information

SYNOPSIS
       chage [options] [LOGIN]

DESCRIPTION
       The chage command changes the number of days between password changes and the date of the
       last password change. This information is used by the system to determine when a user must
       change his/her password.

OPTIONS
       The options which apply to the chage command are:

       -d, --lastday LAST_DAY
	   Set the number of days since January 1st, 1970 when the password was last changed. The
	   date may also be expressed in the format YYYY-MM-DD (or the format more commonly used
	   in your area).

       -E, --expiredate EXPIRE_DATE
	   Set the date or number of days since January 1, 1970 on which the user's account will
	   no longer be accessible. The date may also be expressed in the format YYYY-MM-DD (or
	   the format more commonly used in your area). A user whose account is locked must
	   contact the system administrator before being able to use the system again.

	   Passing the number -1 as the EXPIRE_DATE will remove an account expiration date.

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

       -I, --inactive INACTIVE
	   Set the number of days of inactivity after a password has expired before the account
	   is locked. The INACTIVE option is the number of days of inactivity. A user whose
	   account is locked must contact the system administrator before being able to use the
	   system again.

	   Passing the number -1 as the INACTIVE will remove an account's inactivity.

       -l, --list
	   Show account aging information.

       -m, --mindays MIN_DAYS
	   Set the minimum number of days between password changes to MIN_DAYS. A value of zero
	   for this field indicates that the user may change his/her password at any time.

       -M, --maxdays MAX_DAYS
	   Set the maximum number of days during which a password is valid. When MAX_DAYS plus
	   LAST_DAY is less than the current day, the user will be required to change his/her
	   password before being able to use his/her account. This occurrence can be planned for
	   in advance by use of the -W option, which provides the user with advance warning.

	   Passing the number -1 as MAX_DAYS will remove checking a password's validity.

       -W, --warndays WARN_DAYS
	   Set the number of days of warning before a password change is required. The WARN_DAYS
	   option is the number of days prior to the password expiring that a user will be warned
	   his/her password is about to expire.

       If none of the options are selected, chage operates in an interactive fashion, prompting
       the user with the current values for all of the fields. Enter the new value to change the
       field, or leave the line blank to use the current value. The current value is displayed
       between a pair of [ ] marks.

NOTE
       The chage program requires a shadow password file to be available.

       The chage command is restricted to the root user, except for the -l option, which may be
       used by an unprivileged user to determine when his/her password or account is due to
       expire.

CONFIGURATION
       The following configuration variables in /etc/login.defs change the behavior of this tool:

FILES
       /etc/passwd
	   User account information.

       /etc/shadow
	   Secure user account information.

EXIT VALUES
       The chage command exits with the following values:

       0
	   success

       1
	   permission denied

       2
	   invalid command syntax

       15
	   can't find the shadow password file

SEE ALSO
       passwd(5), shadow(5).

User Commands				    06/24/2011					 CHAGE(1)


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