Check permissions in shell rather than using find -exec

nvm.sh

@@ -1830,8 +1830,18 @@ nvm() {
       fi
 
       # Check version dir permissions
-      local FILES_WITHOUT_WRITE_PERMISIONS="$(find "$VERSION_PATH" -exec [ ! -w "{}" ] \; -exec echo "{}" \;)"
-      if [ "$FILES_WITHOUT_WRITE_PERMISIONS" ]; then
+      local PERMISSIONS_OK=true
+      check_file_permissions() {
+        for FILE in $1/* $1/.[!.]* $1/..?* ; do
+            if [ -d "$FILE" ]; then
+              check_file_permissions "$FILE"
+            elif [ -e "$FILE" ]; then
+              [ ! -w "$FILE" ] && PERMISSIONS_OK=false
+            fi
+        done
+      }
+      check_file_permissions "$VERSION_PATH"
+      if [ "$PERMISSIONS_OK" = false ]; then
         >&2 echo 'Cannot uninstall, incorrect permissions on installation folder.'
         >&2 echo 'This is usually caused by running `npm install -g` as root. Run the following command as root to fix the permissions and then try again.'
         >&2 echo