Polish CLI help behavior

iptables-forward.sh

@@ -15,8 +15,6 @@ on_error() {
 }
 trap 'on_error "$?" "$LINENO"' ERR
 
-require_root || exit $?
-
 # shellcheck source=lib/storage.sh
 source "${LIB_DIR}/storage.sh"
 # shellcheck source=lib/persist.sh
@@ -153,6 +151,14 @@ run_batch() {
 }
 
 main() {
+  case ${1-} in
+    --help|-h)
+      usage
+      return 0
+      ;;
+  esac
+
+  require_root || return $?
   bootstrap
 
   if (($# == 0)); then
@@ -161,9 +167,6 @@ main() {
   fi
 
   case ${1-} in
-    --help|-h)
-      usage
-      ;;
     --batch)
       shift
       run_batch "$@"