Linux User forces initial password change at first logon _linux shell

The following describes how to force users to change their passwords the next time they log on.

Each user account under Linux is associated with the various configuration and information associated with the password. For example, it remembers the date of the last password change, the minimum/maximum number of days between changes in the password, and when the current password expires, and so on.

A command-line tool named Chage can access and adjust the configuration associated with a password expiration failure. You can use this tool to force any user to change their password at the next logon.

To view password expiration information for a user (such as Alice), run the following command. Please note that root user permissions are required only if you are checking the password expiration information for any other user other than yourself.

$ sudo chage-l Alice

Force user to change password

If you want to force users to change their passwords, use this command below.

$ sudo chage-d0 <user-name>

Initially, the "-D <N>" option should be set to the "Expiration date" of the password (the number of days since the password was last changed from January 1, 1970). Therefore, "-d0" indicates that the password was changed on January 1, 1970, which actually makes the current password expire, allowing the password to be changed at the next logon.

Another way to expire the current password is through the passwd command.

$ sudo passwd-e <user-name>

The above command has the same effect as "chage-d0", allowing the user's current password to expire immediately.

Now, once again, check the user's password information, and you will see:

When you log in again, the system will ask you to change your password. You need to confirm the current password multiple times before changing the password.

To set a more comprehensive password policy (such as password complexity and prevent reuse), you can use Pam (what about Pam?). Here is the first to leave a thought, then the article will have the relevant content updates.

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