[OS:N:] bash intro for high school students?

[Robert Citek]

What book or other resource would people recommend for introducing  
high school students to the bash shell?

These are students that are familiar with the pointy-clicky Windows  
environment, and they've picked up KDE using Knoppix pretty quickly.   
But KDE can be awkward at times and some things have to be done  
within a bash shell.  I personally like the O'Reilly book "Learning  
the bash Shell," but perhaps that's a bit much to chew on for an  
intro, or not.  Has anyone else introduced high school students to bash?

Regards,
- Robert
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