how to set different login and root password
20946
Use one password for administration and another for system login
18871
How often is the password asked for sudo commands? Where can I set it up?
88156
Can I set my user account to have no password?
40667
How do I gain root privileges?
96888
Default Password in Ubuntu 15.04
20496
unable to reset root password of mysql
156628
How to Set a Short User Password in macOS Mojave and Later (10.14+)
97950
Can't login using ssh as root
21206
How to make password-less login work
97486
How do I force a user to change a password at the first time login using ssh?
153564
How can I change a set of files Permsissions from Root to user
42702
Can not change permissions while root
113339
Use Windows Live ID, but login with a different password
2634
Key based SSH login that requires both key AND password
1452
How to change root password for mysql and phpmyadmin
19524
How can I determine the sudo password?
71212
login and su internals