There are other ways of doing this, but I thought it would be fun to write a command-line xpath script in ruby using rexml. (full working example here)
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One of the more annoying aspects of writing developer documentation is that it is very easy for your code examples to get out of date, develop typos, etc(As those reading previous articles may have noticed). In this article I use docbook, xslt, and automake to generate code examples that are guaranteed to compile.
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So I used ruby to convert a simple hex string into a binary file in Converting hex to Binary in 4 Languages. Today I was trying to create a mixed ascii/binary file at work and created a little Domain Specific Language that has good possibilities.

NOTE: There is an expanded version of this script here: A Better Binary File Generator DSL in Ruby
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