Taken from Redhat Magazine: Tips and tricks: How do I force users to change their passwords upon first login?
- Firstly, lock the account to prevent the user from using the login until the change has been made:
# usermod -L - Change the password expiration date to 0 to ensure the user changes the password during the next login:
# chage -d 0 - To unlock the account after the change do the following:
# usermod -U
