Linux Commands – chage

Linux Commands – chage

Linux Commands – chage

Hello Everyone

Welcome to CloudAffaire and this is Debjeet.

In the last blog post, we have discussed passwd command in Linux which is used to add, update or delete user’s password.

https://cloudaffaire.com/linux-commands-passwd/

In this blog post, we will discuss chage command in Linux. chage command is used to update user password expiry information. 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. You need to have root or sudo privileges to view other users password expiry information.

Linux Commands – chage:

You can use chage -l or –list options to get an account aging information.

You can use chage -d or –lastday LAST_DAY options to 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). If the LAST_DAY is set to 0 the user is forced to change his password on the next log on.

You can use chage -E or –expiredate EXPIRE_DATE options to 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.

You can use chage -M or –maxdays MAX_DAYS options to 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.

You can use chage -m or –mindays MIN_DAYS options to 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.

You can use chage -I or –inactive INACTIVE options to 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.

You can use chage -W or –warndays WARN_DAYS options to 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.

Hope you have enjoyed this article. In the next blog post, we will discuss usermod command.

 

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