Improve performance of fix-permissions script (#1776)

Author: peterisr

base-notebook/fix-permissions

@@ -23,13 +23,13 @@ for d in "$@"; do
             -group "${NB_GID}" \
             -a -perm -g+rwX \
         \) \
-        -exec chgrp "${NB_GID}" {} \; \
-        -exec chmod g+rwX {} \;
+        -exec chgrp "${NB_GID}" -- {} \+ \
+        -exec chmod g+rwX -- {} \+
     # setuid, setgid *on directories only*
     find "${d}" \
         \( \
             -type d \
             -a ! -perm -6000 \
         \) \
-        -exec chmod +6000 {} \;
+        -exec chmod +6000 -- {} \+
 done