EC Lab 6
due Saturday May 14th, 2011 at 12:01 am

This lab is worth 5 points, which are not part of the
100 that is available through other labs.  These points
are only extra credit.

No modules other than strict should be used for this
lab- this is an exercise in Perl's basic directory
and file manipulation commands, and in a little 
creative recursive programming, if you so desire...

Your lab will accept one parameter at the command
line, which is a directory.  If it isn't a directory,
you should print an error message.

You should open the directory with opendir, read items
with readdir, and close when you are done.  The only
file types that I want to see are ones that agree with
the -d or -f file tests, so no links, named pipes, etc-
only regular files (-f) and directories (-d).

For each directory, ignore the files called "." and ".."
as discussed in class.  Again, also ignore anything which
is not a regular file or a directory.

And now, for the specific items...

1.  Print out the contents of each directory, including
    the owner, gid, and file size of each file that passes
    the conditions mentioned above, and the name of each
    directory.  Sort all the files to the top, with all
    the subdirectories of the given directory listed at
    the bottom.

2.  For each thing that is a directory, ALSO apply rule
    #1 to it, printing the details inline with the rest.

A sample output:

./lab6.pl some_dir


Dir:  some_dir    joseph:staff
        foo       joseph:staff  27
        bar       joseph:staff  48
        Dir:  baz     joseph:staff
          fire        joseph:staff  35
          blood       joseph:staff  57
          Dir: death     joseph:staff
            mud          joseph:staff 10233 
        Dir:  some_other   joseph:staff
          some_file        joseph:staff  23

This output would be for a directory named "some_dir" given at the
command line.  This directory contains the files "foo" and "bar",
as well as the directories "baz" and "some_other".  baz contains
the files "fire" and "blood", and the directory "death", which contains
the file "mud".  The directory "some_other" contains "some_file".  In
this example, all of the files and directories were owned by joseph
and had a group of staff, with the file sizes represented by the
numbers above.