Considering how getting this wrong is extremely dangerous, I feel it deserves an explicit answer. There are many other answers concerning the use of ALL in sudoers, but they do not directly answer this question:
Does ALL refer to users in a group ; Does ALL refer to access to Cmnd_Alias[es] ; OR Can it refer to either and both depending on where it is located in the line?
a group like
REGULARUSER ALL=(ALL) NOPASSWD: SHUTDOWN would mean
ALL users in group
REGULARUSER have access privleges to
In other words the syntax is:
Group \ Users \ Command Permission Specifications. Is this correct?
So that means I can use
ALL in instances like root to grant all privileges to all users in the group, hence the ALL=(ALL:ALL) ALL of user group
Some other questions about the use of