These bootscripts are started at system boot time. The scripts are responsible for mounting the root file system in read-write mode, activating swap, setting up some system settings and starting the various daemons that our system needs.
You need the Sysvinit package again for this section.
We need to start by creating a few extra directories that are used by the boot scripts. Create these directories by running:
root:~# cd /etc
root:/etc# mkdir rc0.d rc1.d rc2.d rc3.d
root:/etc# mkdir rc4.d rc5.d rc6.d init.d rcS.d
Go to the unpacked Sysvinit source directory and copy the Debian/etc/init.d/rc file to /etc/init.d by running:
root:~# cp /usr/src/sysvinit-2.78/debian/etc/init.d/rc /etc/init.d
The second boot script is called rcS and we'll create that one from scratch. Create a new file /etc/init.d/rcS containing the following:
#!/bin/sh
# Begin /etc/init.d/rcS
runlevel=S
prevlevel=N
umask 022
export runlevel prevlevel
trap ":" INT QUIT TSTP
for i in /etc/rcS.d/S??*
do
[ ! -f "$i" ] && continue;
$i start
done
# End /etc/init.d/rcS