User Password Management - English

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Outline:

User Password management 1. Changing user password 2. Locking user password 3. Unlocking a password 3. Password removal 4. Changing the password expiry information 5. passwd command 6. passwd -S 7. passwd -aS 8. passwd -d 9. Minimum age, maximum age, warning period, and inactivity period for the password. 10. /etc/shadow file