remove boxid from cfg file name

sethostname.sh

@@ -1,15 +1,12 @@
 ETHNAME=$(cat /sys/class/net/eth0/address)
-ETHNAME=${ETHNAME//:/}
-BOXID=${ETHNAME: -6}
-FOUND="$(shopt -s nullglob; echo /home/l_samenv/boxtools/cfg/*_$BOXID.cfg)"
+FOUND=($(grep -l -r MAC=$ETHNAME /home/l_samenv/boxtools/cfg))
 if [ -z "$FOUND" ]; then
+   BOXID=${ETHNAME//:/}
+   BOXID=${BOXID: -6}
    HOSTNAME=box$BOXID
 else
    FOUND=$(basename ${FOUND[0]})  # remove directory part
-   HOSTNAME=${FOUND%%.*}  # remove extension
-   if [ $HOSTNAME != "box$BOXID" ]; then
-       HOSTNAME=${HOSTNAME%_*}
-   fi
+   HOSTNAME=${FOUND%%.cfg}  # remove extension
    echo "hostname $HOSTNAME"
 fi
 echo $HOSTNAME > /etc/hostname