[TUHS] The most surprising Unix programs

[Tony Finch]

Dave Horsfall <dave at horsfall.org> wrote:
>
> I have the Towers of Hanoi written in sendmail.cf, meaning that Sendmail is
> Turing-complete :-)  I can't remember who wrote it.

Jonathan Chin: http://www.jhnc.org/hanoi/sendmail-cf.html

It's really easy to fall into the Turing tar-pit, if you have a loop
around regex-based rewriting - and unix mailers often have routing logic
that includes features for rewriting an address and re-routing it.

Tony.
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