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

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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