File Permissions Unix & Linux provides Read(r),Write(w) and Execute(x) permissions to any file on the system. If you ls -l every file with its permissions will be shown.
The system is divided into three types - User,Group and others. The r,w,x permissions are assigned to each type. This is well explained by the diagram shown below:
Owner permissions − The owner’s permissions determine what actions the owner of the file can perform on the file.