Sure, that is the 'init' program (/sbin/init) which needs to be
replaced. Than you can strip down your system to be a two-files-OS (1.
kernel, 2. your init). Doubt whether it is really fun ;-)
Thank you everyone for the replies.
I tried this on a full linux distro and ran into trouble. A tutorial on
this would be interesting. How to put together a kernel, bootloader, and
init script or binary (preferably one simple enough you can write
yourself), sorting out the initrd if necessary, statically compiling any
binaries so you can start with an absolute minimum.
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