Login cancellation question


 
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Old 02-20-2016
Login cancellation question

Purely out of curiosity, but what would happen in all accounts were locked out from being able to be logged in to?? The root account, on most unix-based systems, is locked by default. What if all other login-enabled accounts were changed to be login-disabled?? If such a thing were possible, would there be a possibility of using some way to gain control over the system without being able to login?? Or would the system and its contents be inaccessible?? This is pure curiosity. Obviously, I would never do this if it were possible.
 
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USERDEL(8)						      System Manager's Manual							USERDEL(8)

NAME
userdel - Delete a user account and related files SYNOPSIS
userdel [-r] login DESCRIPTION
The userdel command modifies the system account files, deleting all entries that refer to login. The named user must exist. The options which apply to the userdel command are: -r Files in the user's home directory will be removed along with the home directory itself and the user's mail spool. Files located in other file systems will have to be searched for and deleted manually. FILES
/etc/passwd - user account information /etc/shadow - secure user account information /etc/group - group information CAVEATS
userdel will not allow you to remove an account if the user is currently logged in. You must kill any running processes which belong to an account that you are deleting. You may not remove any NIS attributes on an NIS client. This must be performed on the NIS server. SEE ALSO
chfn(1), chsh(1), passwd(1), groupadd(8), groupdel(8), groupmod(8), useradd(8), usermod(8) AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com) USERDEL(8)