User Administration
In Linux there are three type of users. 1. Super user or root user Super user or the root user is the most powerful user. He is the administrator user. 2. System users System users are the users created by the softwares or applications. For example if we install Apache it will create a user apache. This kind of users are known as system users. 3. Normal users Normal users are the users created by root user. They are normal users like John, Ramu etc. Only the root user has the permission to create or remove a user. In linux systems every user will have a unique user ID. It is known as UID. The Range of UIDs will be as follows: 1. Root user UID will be "0" 2. Systems users UID will be "1 - 499" 3. Normal users UID will be "500 - 60000" The range of MIN_GID and MAX_GID is specified in the file "/etc/login.defs". ######### There are three im...