From c86f31295cf5dcb39edd87aa560fc84a8a0b13ff Mon Sep 17 00:00:00 2001
From: Yifan Wu <shinbokuow@163.com>
Date: Sat, 27 Nov 2021 01:54:59 -0800
Subject: [PATCH] Update os/Makefile, rm ... -f -> rm -f ...

---
 os/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/os/Makefile b/os/Makefile
index 35049e01..505d37ec 100644
--- a/os/Makefile
+++ b/os/Makefile
@@ -33,9 +33,9 @@ build: env switch-check $(KERNEL_BIN)
 
 switch-check:
 ifeq ($(BOARD), qemu)
-	(which last-qemu) || (rm last-k210 -f && touch last-qemu && make clean)
+	(which last-qemu) || (rm -f last-k210 && touch last-qemu && make clean)
 else ifeq ($(BOARD), k210)
-	(which last-k210) || (rm last-qemu -f && touch last-k210 && make clean)
+	(which last-k210) || (rm -f last-qemu && touch last-k210 && make clean)
 endif
 
 env: