1 files changed, 3 insertions, 2 deletions
diff --git a/local/bin/scan_loop.sh b/local/bin/scan_loop.sh
index c0b6321..722e63d 100755
--- a/local/bin/scan_loop.sh
+++ b/local/bin/scan_loop.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # The scan loop is useful when Automatic Document Feeder (ADF) can't be used
 
@@ -25,8 +25,9 @@ flatbed_loop() {
         hp-scan --mode=color --size=a4 --device=$scan_device_uri
         echo "page " $((i + 1)) " done,  you have 4 seconds to load next page"
         sleep 4
-        i=`expr $i + 1`
+        i=$((expr $i + 1))
     done
     # convert *.png output.pdf
 }
 
+flatbed_loop