CHANNEL_FREQ=$1 echo $CHANNEL_FREQ CHANNEL=0 if [ "$CHANNEL_FREQ" -ge 5745 ] ; then let "CHANNEL = (($CHANNEL_FREQ - 5745) / 5) + 149" elif [ "$CHANNEL_FREQ" -ge 5180 ] ; then let "CHANNEL = (($CHANNEL_FREQ - 5180) / 5) + 36" elif [ "$CHANNEL_FREQ" -ge 2412 ] ; then let "CHANNEL = (($CHANNEL_FREQ - 2412) / 5) + 1" else echo "FREQ in not in range" fi echo $CHANNEL