Simple kernel script

#!/bin/bash
KERNELVER="3.9.3"
KERNELNAME="-amd64-patschi"
USECORES=8

echo "> Making kernel Linux $KERNELVER..."

if [ ! -f "linux-$KERNELVER.tar.xz" ]; then
        echo "> Downloading kernel..."
        wget https://www.kernel.org/pub/linux/kernel/v3.x/linux-$KERNELVER.tar.xz
fi

if [ ! -d "linux-$KERNELVER" ]; then
        echo "> Unpacking kernel..."
        tar xf linux-$KERNELVER.tar.xz
fi

cd linux-*

echo "> Using defaults with config questions..."
yes "" | make oldconfig
export CONCURRENCY_LEVEL=$USECORES

echo "> Compiling..."
fakeroot make-kpkg --initrd --append-to-version=$KERNELNAME kernel-image kernel-headers modules_image

echo " "
echo "> Work done, Sir!"