chage

 

Linux chage Command.

 

   Linux chage command is use to chage user password expiry information on Linux system.  The Linux chage command is one of external shell command that locate under /usr/bin/ directory.  The command example below show how to get chage command manual using shell command, this help show information on how to use the Linux chage command, the chage command options and the arguments that can be use with Linux chage command.

 

Get Linux chage command manual

 

  Execute man command and the name of Linux command that we want the manual file, the example below we execute man command get the manual for chage command.

Linux chage Command, change user password expiry information

[linux@fedora11 ~]$ man chage

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.

 

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                     05/25/2008                          CHAGE(1)

 

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