s/^/0000 is -RWXRWXRWX/
:0
h
s/[RWX]/-/gp
g
s/ /~ /
:
s/~/<1234567~01>/
s/\(.\)<.*\1\(~*.\).*>/\2/
t
s/.[rwx]*$/\U\l&/
/777/!b0