How does the Linux login work?
71212
login and su internals
18871
How often is the password asked for sudo commands? Where can I set it up?
155972
Displaying server information at login prompt (Ubuntu)
136007
How to enable root login again after changing password?
76109
How to return the currently active user/session on a graphical Linux desktop session?
156896
Is it possible to create an Admin Password Key to conveniently login?
2850
Ubuntu gets stuck in a login loop
113715
Authentication mechanism to connect to Windows AD in Linux?
42443
Does Windows allow multiple (remote) logins to the same account at the same time via whatever means?
4227
How do I login as root?
20385
How to run a command at login?
88793
openSuse, new user cannot login
151084
Can I programmatically login a user without a password?
155610
What is my login username and password?
133958
Why is the 'sudo' password different than the 'su root' password
30487
How to force a login for an administrator when using Remote Desktop Connection?
90170
How do admins maintain user accounts across hundreds of linux servers?