CHMOD Permissions Reference Chart
This is how I remember permissions and most likely, it will help you remember it as well.
User Group Other
Read 4 4 4
Write 2 2 2
Execute 1 1 1
U G O
X X X
Chmods:
777 = rwxrwxrwx
755 = rwxr-xr-x
644 = rw-r--r--
700 = rwx------
750 = rwxr-x---
