diff --git a/scripts/get_os.sh b/scripts/get_os.sh
index a062d83f..721e639b 100644
--- a/scripts/get_os.sh
+++ b/scripts/get_os.sh
@@ -108,5 +108,7 @@ shift
 done
 shift
 
+[ "$1" ] && cmd="$1"
+
 eval cmd_$cmd