Imagine, for example, that you mistakenly deleted the <command>dpkg</command> program, and that you could thus no longer install Debian packages. <command>dpkg</command> being a Debian package itself, it would seem your system would be done for... Fortunately, you know the format of a package and can therefore <ulink url="https://www.debian.org/distrib/packages#search_packages">download</ulink> the <filename>.deb</filename> file of the <emphasis role="pkg">dpkg</emphasis> package and install it manually (see sidebar <xref linkend="sidebar.dpkg-apt-ar" />). If by some misfortune one or more of the programs <command>ar</command>, <command>tar</command> or <command>gzip</command>/<command>xz</command>/<command>bzip2</command> have disappeared, you will only need to copy the missing program from another system (since each of these operates in a completely autonomous manner, without dependencies, a simple copy will suffice). If your system suffered some even more outrageous fortune, and even these don't work (maybe the deepest system libraries are missing?), you should try the static version of <command>busybox</command> (provided in the <emphasis role="pkg">busybox-static</emphasis> package), which is even more self-contained, and provides subcommands such as <command>busybox ar</command>, <command>busybox tar</command> and <command>busybox xz</command>.
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