#! /bin/sh

for d in "$@"; do
   if [ -d "$d" ]; then
      if [ "$d" = .. ]; then
         echo 'Cannot operate on ".."!' >&2
         exit 1
      fi
      chmod u+rwX,go+rX "$d"
      find "$d" -type d -print0 | xargs -r0 chmod u+rwX,go+rX
      find "$d" -type f -print0 | xargs -r0 chmod u+rwX,go+rX
   else
      chmod u+rwX,go+rX "$d"
   fi
done