diff --git a/build.sh b/build.sh
index 0cc9368..679a99b 100755
--- a/build.sh
+++ b/build.sh
@@ -1,45 +1,31 @@
-#!/bin/bash -e
-# Tiny Linux Bootloader
-# (c) 2014- Dr Gareth Owen (www.ghowen.me). All rights reserved.
-
-#    This program is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU General Public License as published by
-#    the Free Software Foundation, either version 3 of the License, or
-#    (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU General Public License for more details.
-#
-#    You should have received a copy of the GNU General Public License
-#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#!/bin/sh -e
 
 INPUT="bsect.asm"
 OUTPUT="disk"
-KERN="./barebones"
+KERN="./barebone"
 RD="./big.init"
 
 #size of kern + ramdisk
-K_SZ=`stat -c %s $KERN`
-R_SZ=`stat -c %s $RD`
+K_SZ=$(stat -c %s $KERN)
+R_SZ=$(stat -c %s $RD)
 
 #padding to make it up to a sector
-K_PAD=$((512 - $K_SZ % 512))
-R_PAD=$((512 - $R_SZ % 512))
+K_PAD=$((512 - K_SZ % 512))
+R_PAD=$((512 - R_SZ % 512))
 
-nasm -o $OUTPUT -D initRdSizeDef=$R_SZ $INPUT
+nasm -o $OUTPUT -D initRdSizeDef="$R_SZ $INPUT"
 cat $KERN >> $OUTPUT
-if [[ $K_PAD -lt 512 ]]; then
-    dd if=/dev/zero bs=1 count=$K_PAD >> $OUTPUT
+if [ $K_PAD -lt 512 ]; then
+dd if=/dev/zero bs=1 count=$K_PAD >> $OUTPUT
 fi
-
 cat $RD >> $OUTPUT
-if [[ $R_PAD -lt 512 ]]; then
-    dd if=/dev/zero bs=1 count=$R_PAD >> $OUTPUT
+if [ $R_PAD -lt 512 ]; then
+dd if=/dev/zero bs=1 count=$R_PAD >> $OUTPUT
 fi
 
-TOTAL=`stat -c %s $OUTPUT`
-echo "concatenated bootloader, kernel and initrd into ::> $OUTPUT"
-echo "Note, your first partition must start after sector $(($TOTAL / 512))"
+TOTAL=$(stat -c %s $OUTPUT)
+printf "concatenated bootloader, kernel and initrd into ::> %s\n" "$OUTPUT"
+printf "Note, your first partition must start after sector %s\n" "$((TOTAL / 512))"
+
+