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The chmod Function (UNIX)

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