O

Octal Mode
This sets permissions using the base-8 octal numbering system

Octal Values
Refers to the base-8 number system, which uses just eight unique symbols (0, 1, 2, 3, 4, 5, 6, and 7). Programs often display data in octal format because it is relatively easy for humans to read and can easily be translated into binary format, which is the most important format for computers.

Operating System
This is the software responsible for running the computer system. It is responsible for allocating CPU time, memory space, peripheral access and so on.

Owner Permissions
Shows the type of access the owner of the file has. In accordance to the users logon it also grants access to different files and directories.