Hey!
First off, this is licensed under the GPLv2, you can find a copy of it in the file called LICENSE.

Second off, you could easily change this to take an argument of the offset to make it a proper Caesar Cypher.

Usage:
echo WOOP | ./vogon_translator
and
./vogon_translator "WOOP"
are the same.

Piping the input in is preferred, however, as you can then do: cat Jabberwocky | ./vogon_translator
the rest is self explanatory :)

I've included Jabberwocky so that you can try this for yourself :)

This requires unistd.h to run, although the compiled version should work on any Linux box just fine.

NB: Sorry for the horrible coding, I made this at about 2:00 -> 3:00 with no caffeine.

- Galle

PS: Have a screenshot: