add usage error message

grafana · Jul 12, 2022 · 3d8f90c · 3d8f90c
1 parent 191f3a0
commit 3d8f90c
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/cmd/parquet-tool/main.go b/cmd/parquet-tool/main.go
@@ -11,6 +11,10 @@ import (
 )
 
 func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("Usage: parquet-tool <file>")
+		os.Exit(1)
+	}
 	f, err := os.Open(os.Args[1])
 	if err != nil {
 		panic(err)