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→File Permissions
===File Permissions===
Since the Unix / Linux operating systems allow for multiple users to be created on a single server,<br>it is essential for users on these servers to '''share''' or '''limit''' access to directories and files contained in those directories.
When directories and regular files are created, then are assigned ownership to a user account.
To allow or limit access to those files and directories, those files and directories are assigned to an initial group referred to as a primary group.
Users that belong within the same group are referred to as same group members, and those users are do NOT belong within a group are referred to as other group members.
In this course, we cannot create groups or assign users to groups - you may learn how to do that if you take a Unix/Linux administration account.
On the other hand, you can change which user, existing same group members or existing other group members can or cannot access a directory or regular file.
Permissions act like a two-layered defence: First, the directory that contains regular files, and second, to the regular files themselves.
[[Image:listing-file-directory.png|thumb|right|100px|]]
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