From 0957786a286e5a43d5c662ee6e67677c0e7fb30f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=83=9F=E8=8D=89=E7=9A=84=E9=A6=99=E5=91=B3?=
 <hujingnb@qq.com>
Date: Sun, 22 May 2022 13:33:08 +0800
Subject: [PATCH] Update killall.md (#364)

---
 command/killall.md | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/command/killall.md b/command/killall.md
index 57a4cbd6aa..865f9b27d3 100644
--- a/command/killall.md
+++ b/command/killall.md
@@ -33,10 +33,14 @@ killall(选项)(参数)
 
 ###  实例
 
-杀死所有同名进程
-
 ```shell
+# 杀死所有同名进程
 killall vi
+# 指定向进程发送的信号
+killall -9 vi
+# 0信号表示不向进程发送信号, 可通过返回值判断进程是否存在, 0(存在)1(不存在)
+killall -0 vi
+echo $?
 ```