We will tire of telling you that many of the advantage of Linux are a result of its springing from a strong multi-user operating system. In a multi-user system, it is important to ensure that the file of one user cannot be accessed by another user unless the latter is permitted to access those files. This gives idea of file ownership. The user who creates a file is, by default, the owner of that file. He can do what ever he wishes to do to his file, such as editing and deleting. A user group can also own a file, if a member of the group has created the file. The user group will have the same permissions as that of the file creator. This is an important feature, because there can be instances where a group of users are working on a project and files created by one user have to be accessible and editable by others in the group. Besides the owner of the file and his user group, other users can be granted privileges that will enable them to work on the files created by the owner.
