Octal   Binary       Permissions            Meaning
0       000          none                   All turned off
1       001          --x                    Execute
2       010          -w-                    Write
3       011          -wx                    Write, execute
4       100          r--                    Read
5       101          r-x                    Read, execute
6       110          rw-                    Read, write
7       111          rwx                    Read, write, execute