handy tinycore remastering script from coreplayer2 (see http://goo.gl/c6uQh). Takes the tedium out of it.

tc_remaster.sh

#!/bin/sh
. /etc/init.d/tc-functions


# Use this script to extract and re-package core.gz, core64.gz or corepure64.gz
# 
# Note
# When repackaging a x86_64 core, use this script on same type system (core64 or corepure64)
#
# How to..
# Copy this script and core*.gz to /tmp directory then
# Run script once to extract, after making necessary changes 
# run script again to repackage, when done
# look in /tmp/core_package for new file


################################################################
#cleanup, extract & repackage functions

f_cleanup() {
clear
$user rm -rf /tmp/core_extract
$user rm -rf /tmp/core_package
mycore=mycore
rm -f $mycore 
}

f_extract() {
# prepare directories
mkdir -p /tmp/core_extract
mkdir -p /tmp/core_package

#extract core*.gz
cd /tmp/core_extract && zcat /tmp/$mycore | $user cpio -i -H newc -d
}

f_repack() {
cd /tmp/core_extract

#update modules list
$user depmod -a -b /tmp/core_extract `uname -r`

#re-package and compress new core*gz
$user find | $user cpio -o -H newc | $user gzip -2 > /tmp/core_package/$mycore
$user advdef -z4 /tmp/core_package/$mycore
}

################################################################
##main script

trap 'f_cleanup ; trap 2 ; kill -2 $$' 1 2 3 13 15

[ `/usr/bin/id -u` -ne 0 ] && user=sudo

if [ -e /tmp/core_package/core*.gz ]; then
	echo "core.gz exists already,"
	read -n1 -p "Continue..? (y/n)" yn
	case $yn in
		[yY] ) f_cleanup;;
		[nN] ) echo -e "\nexit.."; exit;;
	esac
fi

#mycore=`$user find /tmp -maxdepth 1 -name "core*.gz" | sed 's/\/tmp\///g'`
mycore=`$user find /tmp -maxdepth 1 -name "core*.gz" | cut -d/ -f3`

while [ "$ep" != [ep] ]; do
set +x
clear

if [ -n "$mycore" ]; then
	printf "\033[2;4HProcessing $mycore"
else 
	printf "\033[2;4H${YELLOW}core*gz file not found${NORMAL}\n"
	exit
fi


printf "\033[4;0HRun script once to extract, then \nRun script again to re-package"


## create choice
printf "\033[7;4H${BLUE}Choose ${WHITE}(${MAGENTA}E${NORMAL}/${MAGENTA}e${WHITE})${BLUE} to Extract or"
printf "\033[8;4HChoose ${WHITE}(${MAGENTA}P${NORMAL}/${MAGENTA}p${WHITE})${BLUE} to re-Package\n\n" 

##print divider - full screen/terminal width
width=`stty size | cut -d" " -f2`
printf '%*s' "$(( width ))" '' | tr ' ' ~

printf "${NORMAL}\n\n"

	read -s -n1 -p "" ep

set -x
	case $ep in
		[Ee] ) 
			find /tmp -name core_extract | xargs $user rm -rf ;
			set +x
			echo -e "${WHITE}Extracting $mycore${NORMAL}"
			set -x
			f_extract
			set +x
			echo -e "\n${BLUE} $mycore extract completed${NORMAL} - when ready, run this script again with P option to repack\n"
			exit
		;;
			
		[Pp] ) 
			set +x
			echo -e "${WHITE}RePacking $mycore please wait...${NORMAL}"
			set -x
			f_repack
			set +x
			echo -e "\n${BLUE} $mycore repackage complete${NORMAL}\n"
			$user rm -rf /tmp/core_extract
			exit
		;;
			
		* ) 
			echo -e "Key not supported, please try again"
		;;

	esac
done

exit