755
rwxr-xr-x — Executable/directory
644
rw-r--r-- — Regular file
700
rwx------ — Private executable
600
rw------- — Private file
777
rwxrwxrwx — Full access (dangerous)
444
r--r--r-- — Read-only all
775
rwxrwxr-x — Group writable dir
664
rw-rw-r-- — Group writable file
400
r-------- — SSH private key
750
rwxr-x--- — Restricted executable