From b9f50fd15d3deb85d09b8fbc953e5036bbd67b1f Mon Sep 17 00:00:00 2001
From: ache <ache@ache.one>
Date: Mon, 14 Nov 2016 12:34:43 +0100
Subject: Message when backlight isn't detected

---
 light2.sh | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

(limited to 'light2.sh')

diff --git a/light2.sh b/light2.sh
index 5f0c501..20e68a9 100755
--- a/light2.sh
+++ b/light2.sh
@@ -12,8 +12,12 @@ else
     val="$1"
 fi
 
-for backlight in "$listBacklight"
-do
-    echo "${val}" | sudo tee "/sys/class/backlight/${backlight}/brightness" 2>&1 /dev/null
-done
+if [ -n "$listBacklight" ] ; then
+    for backlight in "$listBacklight"
+    do
+        echo "${val}" | sudo tee "/sys/class/backlight/${backlight}/brightness" 2>&1 /dev/null
+    done
+else
+    echo 'No backlight detected'
+fi
 
-- 
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