diff --git a/src/tool/in/main.go b/src/tool/in/main.go
index c1a3fdd..3f2e5e2 100644
--- a/src/tool/in/main.go
+++ b/src/tool/in/main.go
@@ -28,7 +28,10 @@ func Run(args []string) {
 	args = flagSet.Args()
 
 	if len(args) == 0 {
-		flagSet.Usage()
+		//flagSet.Usage()
+		if !not {
+			os.Exit(1)
+		}
 	}
 
 	mp := make(map[string] int)