From 7af784adce32592a2758b3e72d1eebb89e1dd7ae Mon Sep 17 00:00:00 2001
From: neilpang <github@byneil.com>
Date: Fri, 11 Nov 2016 22:30:55 +0800
Subject: [PATCH] fix shellcheck warnings

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

diff --git a/acme.sh b/acme.sh
index 4a5b1118..c5e09264 100755
--- a/acme.sh
+++ b/acme.sh
@@ -548,7 +548,7 @@ _createkey() {
 _is_idn() {
   _is_idn_d="$1"
   _debug2 _is_idn_d "$_is_idn_d"
-  _idn_temp=$(printf "%s" "$_is_idn_d" | tr -d '[0-9]' | tr -d '[a-z]' | tr -d 'A-Z' | tr -d '.,-')
+  _idn_temp=$(printf "%s" "$_is_idn_d" | tr -d '0-9' | tr -d 'a-z' | tr -d 'A-Z' | tr -d '.,-')
   _debug2 _idn_temp "$_idn_temp"
   [ "$_idn_temp" ]
 }