Example Bourne shell scripts

I've written a bunch of short Bourne shell scripts to illustrate how they work.

• showstuff
• whon
• swap
• thrice
• indir
• p3
• p3_alternate: another way of handling optional command-line arguments
• p4
• p4_alternate: an even slicker way of writing a self-reproducing shell script
• xprod: an example of back-quoting and for-loops