The answers for all exercises can be found in Section A.6. 7.8.1 Exercise 1 [15 min]Using the glob operator, a naive sort of every name in the /bin directory by their relative sizes might be written as: my @sorted = sort { -s $a <=> -s $b } glob "/bin/*"; Rewrite this using the Schwartzian Transform technique. If you don't have many files in the /bin directory, perhaps because you don't have a Unix machine, change the argument to glob as needed. 7.8.2 Exercise 2 [15 min]Read up on the Benchmark module, included with Perl. Write a program that will answer the question, "How much does using the Schwartzian Transform speed up the task of Exercise 1?" 7.8.3 Exercise 3 [10 min]Using a Schwartzian Transform, read a list of words, and sort them in "dictionary order." Dictionary order ignores all capitalization and internal punctuation. Hint: The following transformation might be useful: my $string = "Mary-Ann"; $string =~ tr/A-Z/a-z/; # force all lowercase $string =~ tr/a-z//cd; # strip all but a-z from the string print $string; # prints "maryann" Be sure you don't mangle the data! If the input includes the Professor , and The skipper , the output should have them listed in that order, with that capitalization. 7.8.4 Exercise 4 [20 min]Modify the recursive directory dumping routine so it shows the nested directories through indentation. An empty directory should show up as: sandbar, an empty directory while a nonempty directory should appear with nested contents, indented two spaces: uss_minnow, with contents: anchor broken_radio galley, with contents: captain_crunch_cereal gallon_of_milk tuna_fish_sandwich life_preservers |