From 8f0ff4bb63a8fd26741128a851c224af323eb772 Mon Sep 17 00:00:00 2001
From: ningwei1993 <ningwei1993@icloud.com>
Date: Mon, 7 May 2018 06:39:28 +0800
Subject: [PATCH] fix bug for check zsh (#6798)

---
 tools/install.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/install.sh b/tools/install.sh
index 1a0a8e6db..ad47df785 100755
--- a/tools/install.sh
+++ b/tools/install.sh
@@ -24,7 +24,7 @@ main() {
   # which may fail on systems lacking tput or terminfo
   set -e
 
-  if command -v zsh >/dev/null 2>&1; then
+  if ! command -v zsh >/dev/null 2>&1; then
     printf "${YELLOW}Zsh is not installed!${NORMAL} Please install zsh first!\n"
     exit
   fi