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Sunday, September 13, 2009

Linux: Force Users To Change Their Passwords Upon First Login

How can I force my Linux users to change their passwords upon the first login under CentOS / Debian Linux?

You can use any one of the following command to change user passwords upon the first login:
  • usermod command - Modify various user account properties including user password expiry information.
Where,
  • chage command - Change user password expiry information
Task: Use chage command to force users to chage their password upon first login

Use the following syntax: chage -d 0 <user-name>
chage -d 0 bubba
  • -d 0 : 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. By setting it to zero, you are going to force user to change password upon first login.

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