How to force users to change their passwords on 1st login
1.) Firstly, lock the account to prevent the user from using the login until the change has been made:
# usermod -L <username>
2.) Change the password expiration date to 0 to ensure the user changes the password during the next login:
# chage -d 0 <username>
3.) To unlock the account after the change do the following:
# usermod -U <username>
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