The sudoers file has the following line:
root ALL=(ALL) ALL
I have read that the first field is the user. Then first
ALL is all terminals, and
(ALL) means as any user, and last
ALL means any commands.
What happens when we don't have this line in sudoers file? Then root couldn't do anything?
username ALL= /bin/passwdlike this, whether it could be interpreted as "username" can run passwd from ALL terminals
What values can be given instead of first