What are the three predefined Linux file permissions?

The predefined Linux file permissions are read, write, and execute.

Read permission allows a user to view the contents of a file. If a user has read permission on a directory, they can list the contents of that directory. Write permission enables a user to modify the contents of a file or add or remove files in a directory. Execute permission allows a user to run a file as a program or script, and in the context of directories, it permits a user to enter the directory and access files and folders within it.

These three permissions are fundamental to the Linux security model, allowing for a flexible and multi-user environment where access control is critical. This set of permissions can be assigned to three different categories of users: the owner of the file, the group associated with the file, and all other users.

In contrast to the options provided, others do not represent the standard permissions recognized in Linux. For example, "modify" refers to an action often associated with write access but is not a separate category itself within Linux permissions. Similarly, terms like "archive" and "append" are not standard permissions recognized in the Linux permission model. Understanding these core permissions is essential for managing security and access in a Linux environment.