[Galaxy Note 10.1 Android Development] TweakerL:
So yea I've been working on a proper "app2sd" solution that doesn't involve just switching the MicroSD for the eMMC, but I like the stock rom so far, so I didn't feel like flashing a rom just to get init.d, and I didn't feel like modifying the ramdisk in the kernel either. So I cooked up this script that anyone can run from terminal to get init.d support. It should work for other devices too, as long as they run /system/etc/install-recovery.sh on boot.

There's only three requirements for it to work:

#1 You must be rooted

#2 Your device must run /system/etc/install-recovery.sh

#3 You must have busybox

I tested a few times on my own device (GT-N8013), but haven't had anyone else test it, so don't freak out if it doesn't work. Just let me know what went wrong and I'll figure something out.

Running it is very simple:

#1 Open any terminal app

#2 su

#3 navigate to the folder where you have the script

#4 sh ./enableinit.sh

Your device will be rebooted once the process is done, don't freak out. If everything went fine, you'll have a file in /sdcard called init.d.log created by the test init.d script that is made by the enabler.

You can either download the attachment (rename it to enableinit.sh if you get the attachment), or create the file with the contents betlow:

#!/system/bin/sh
# Adds init.d support to any device that automatically runs /system/etc/install-recovery.sh
# on startup.
#
# Made by TweakerL, make sure to visit us at and-host.com or chat with us on freenode #and-host

echo '##################################################'
echo '## ##'
echo '## Script by TweakerL ##'
echo '## Visit us at and-host.com ##'
echo '## Chat with us at freenode #and-host ##'
echo '## ##'
echo '##################################################'
echo ''
echo 'This script will enable init.d if your device'
echo 'executes /system/etc/install-recovery.sh'
echo ''
echo 'Your tablet will be rebooted once the process'
echo 'is done.'
echo ''
echo 'If the script successfully enabled init.d you will'
echo 'have a file in /sdcard called init.d.log after'
echo 'the device is done rebooting. Remember to always'
echo 'set the proper permissions in your scripts or they'
echo 'will not work.'
echo ''
read -p "Press ENTER to continue..."

if [ ! -f /system/xbin/busybox -a ! -f /system/bin/busybox ]
then
echo 'You do not have busybox. Exiting now...'
else

# Mount system as rw in order to execute the script
busybox mount -o remount,rw -t ext4 /dev/block/mmcblk0p9 /system

# Check if install-recovery.sh already exists, and if so
# add the necessary lines, otherwise create it
if [ -f /system/etc/install-recovery.sh ]
then
if cat /system/etc/install-recovery.sh | busybox egrep -i "sysinit"
then
echo sysinit already present in install-recovery.sh, skipping this step.
else
busybox cp -f /system/etc/install-recovery.sh /sdcard/qsxdrgbhuk.sh
echo '' >> /sdcard/qsxdrgbhuk.sh
echo '/system/bin/sysinit' >> /sdcard/qsxdrgbhuk.sh
busybox cp -f /sdcard/qsxdrgbhuk.sh /system/etc/install-recovery.sh
fi
else
echo '#!/system/bin/sh' >> /sdcard/qsxdrgbhuk.sh
echo '' >> /sdcard/qsxdrgbhuk.sh
echo '/system/bin/sysinit' >> /sdcard/qsxdrgbhuk.sh
busybox cp -f /sdcard/qsxdrgbhuk.sh /system/etc/install-recovery.sh
busybox chmod 755 /system/etc/install-recovery.sh
fi

# Check if sysinit already exists and if so skip step
# otherwise create it
if [ ! -f /system/bin/sysinit ]
then
echo '#!/system/bin/sh' >> /sdcard/kuhbgrdxsq
echo 'export PATH=/sbin:/system/sbin:/system/bin:/system/xbin' >> /sdcard/kuhbgrdxsq
echo '' >> /sdcard/kuhbgrdxsq
echo '/system/bin/logwrapper busybox run-parts /system/etc/init.d' >> /sdcard/kuhbgrdxsq

busybox cp -f /sdcard/kuhbgrdxsq /system/bin/sysinit
busybox chmod 755 /system/bin/sysinit
else
echo sysinit already exists in /system/bin. init.d should already be enabled.
fi

# Cleanup
busybox rm -f /sdcard/qsxdrgbhuk.sh
busybox rm -f /sdcard/kuhbgrdxsq

#Check that init.d folder exists and if not create it
# as well as set the right permissions
if [ -d '/system/etc/init.d' ]
then
chmod 755 /system/etc/init.d
else
mkdir /system/etc/init.d
chmod 755 /system/etc/init.d
fi

# Create a test init.d script that echoes a file to
# /sdcard on successful execution
echo '#!/system/bin/sh' > /sdcard/99testinit
echo '' >> /sdcard/99testinit
echo 'echo init.d works > /sdcard/init.d.log' >> /sdcard/99testinit
busybox cp -f /sdcard/99testinit /system/etc/init.d
chmod 755 /system/etc/init.d/99testinit
busybox rm -f /sdcard/99testinit

# Sync and remount system
sync
busybox mount -o remount,ro -t ext4 /dev/block/mmcblk0p9 /system

# Reboot system to enable init.d
if [ -f /system/bin/reboot ]
then
echo Your device will reboot in 3 seconds
sleep 3
reboot
else
echo "Your device doesn't appear to have a reboot command,"
echo "please reboot your device now to avoid problems."
fi
fi