From d5b0b36758cbff8c9906fd4c052d69c2c031f8c7 Mon Sep 17 00:00:00 2001
From: He Yin Ling <heyinling@espressif.com>
Date: Mon, 26 Aug 2019 11:00:33 +0800
Subject: [PATCH] Apply suggestion to tools/ci/build_examples.sh

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

diff --git a/tools/ci/build_examples.sh b/tools/ci/build_examples.sh
index c300452e7..733e55bbf 100755
--- a/tools/ci/build_examples.sh
+++ b/tools/ci/build_examples.sh
@@ -62,7 +62,7 @@ SDKCONFIG_DEFAULTS_CI=sdkconfig.ci
 
 EXAMPLE_PATHS=$( find ${IDF_PATH}/examples/ -type f -name Makefile | grep -v "/build_system/cmake/" | sort )
 
-if [ -z {CI_NODE_TOTAL} ]
+if [ -z "${CI_NODE_TOTAL:-}" ]
 then
     START_NUM=0
     END_NUM=999