Linux Forums: Understanding File Permissions

[ Thanks to An Anonymous Reader for
this link. ]

“In GNU/Linux, file access is restricted. Users don’t
necessarily have the same rights when it comes to deleting,
executing or even reading files. In fact, every file contain data
such as its owner, its permissions and other information which
defines exactly what can be done with it, and by whom.

“Note: GNU/Linux treats everything as a file. As a consequence,
directories use the same permission scheme…”