All that it does is to show the user a console with some text to which a special key is to be entered. After that everything else is automatic and the user must only acknowledge the end of the process before rebooting the machine. This is a dedicated application, not a general Linux. It could turn out that it takes equal time to strip down a DSL or Puppy (or Slax...) to make it as bare as possible. Also, that USB key is already in service and works well, albeit without Perl.

While adding Perl, I though of doing a bit of generalization of the key and derive it from LFS instead. I already build LFS systems, of course. If not, then _that_ would take a lot of time ! ;-)