From 7ff7a7c527ca9aa6c02d7722717ede9dd8e50b37 Mon Sep 17 00:00:00 2001
From: neilpang <github@byneil.com>
Date: Fri, 11 Nov 2016 21:31:16 +0800
Subject: [PATCH] fix shellcheck warnning

---
 acme.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/acme.sh b/acme.sh
index 79afb237..705f5a9b 100755
--- a/acme.sh
+++ b/acme.sh
@@ -259,7 +259,7 @@ _exists() {
 
 #a + b
 _math() {
-  $(( "$@" ))
+  printf "%s" "$(( $@ ))"
 }
 
 _h_char_2_dec() {