-wget -c ftp://ftp.kernel.org/pub/linux/kernel/v$MAJOR/linux-$VERSION.tar.bz2
-tar xjvf linux-$VERSION.tar.bz2
-rm -f linux-$VERSION.tar.bz2
-mv linux linux-$VERSION
-ln -s linux-$VERSION linux
+wget -c "ftp://ftp.kernel.org/pub/linux/kernel/v$MAJOR/linux-$VERSION.tar.bz2"
+tar xjvf "linux-$VERSION.tar.bz2"
+if [ -h linux ]; then mv linux "linux-$VERSION"; fi
+ln -s "linux-$VERSION" linux