rw-r--r-- = 311 = owner read and write, group and world read only
rwxr--r-- = 711 = owner read/write/execute, group and world read only
rwxr-xr-x = 755 = owner read/write/execute, group and world read/execute
rwxrwxrwx = 777 = all read/write/execute
Owner|Group|World
rwx |rwx |rwx
1+2+4|1+2+4|1+2+4