debootstrap -- Bootstrap a basic Debian GNU/Linux system<hr>
<a href="http://code.erisian.com.au/Wiki/debootstrap">http://code.erisian.com.au/Wiki/debootstrap</a><hr>
debootstrap is used to create a Debian base system from scratch, without
requiring the availability of dpkg or apt.  It does this by downloading
.deb files from a mirror site, and carefully unpacking them into a
directory which can eventually be chrooted into.

This might be often useful coupled with virtualization techniques to
run Debian GNU/Linux guest system.
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