Under Unix, there are two kinds of users:
The administrator (root) who has all rights to the system and is responsible for the proper functioning of the system
The administrator registers each new user.
Each user is referenced by a unique identifier number (
UID). The match between the UID and the name
of the user is stored in a specific file
passwd located in the directory
Users are gathered in groups. Users in the same group can have special access to files belonging to users of this group.
Each user group is referenced by a unique identifier number (
GID). The correspondence between the GID
and the group name is stored in a specific
group file located in the