See Section A.11, "Answers to Chapter 12 Exercises" for answers to the following
 Write a program to ask the user for a directory name, then
change to that directory. If the user enters a line with nothing but
whitespace, change to his or her home directory as a default. After
changing, list the ordinary directory contents (not the items whose
names begin with a dot) in alphabetical order. (Hint: Will that be
easier to do with a directory handle or with a glob?) If the
directory change doesn't succeed, just alert the user -- but
don't try show the contents.
 Modify the program to include all files, not just the ones that
don't begin with a dot.
 If you used a directory handle for the previous exercise, rewrite
it to use a glob. Or if you used a glob, try it now with a directory
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