diff --git a/townandmail.sh b/townandmail.sh
index da2ae8e..559cbac 100755
--- a/townandmail.sh
+++ b/townandmail.sh
@@ -35,7 +35,7 @@
 
 umask=077
 
-PROGRAMM_NAME=`basename $0`
+PROGRAMM_NAME=$(basename $0)
 DEBUG=0
 VERBOSITY=0
 NEW_GS=0
@@ -154,9 +154,9 @@ msg_start "Try to match postalcode and townname with community key ... "
 while IFS=, read -r ort plz mail; do
     gs=$(grep "$plz" $GS_FILE | grep ",$ort," | cut -d ',' -f 3)
     if [ -z "$gs" ] ; then
-        FAILS=$(expr $FAILS + 1)
+        FAILS=$(( FAILS + 1 ))
     else
-        MATCH=$(expr $MATCH + 1)
+        MATCH=$(( MATCH + 1 ))
         echo "$gs,$mail" >>$GS_MAIL
     fi
     echo "$plz,$ort,$mail" >>$TMP_OUT
@@ -180,16 +180,16 @@ while IFS=, read -r ort plz ; do
     if [ -z "$resp" ] ; then
         gs=$(grep "$plz" $GS_FILE | grep ",$ort," | cut -d ',' -f 3)
         if [ -z "$gs" ] ; then
-            FAILS=$(expr $FAILS + 1)
+            FAILS=$(( FAILS + 1 ))
             echo "$plz,$ort,cant get community key" >>$FALLOUT
         else
             mail=$(grep "$gs" $GS_MAIL | cut -d ',' -f 2)
             if [ -z $mail ] ; then
-                FAILS=$(expr $FAILS + 1)
+                FAILS=$(( FAILS + 1 ))
                 echo "$plz,$ort,cant get email for $gs" >>$FALLOUT
             else
                 echo "$plz,$ort,$mail" >>$TMP_OUT
-                MATCH=$(expr $MATCH + 1)
+                MATCH=$(( MATCH + 1 ))
             fi
         fi
     fi