File Selection Dialog Box

Usage:  filebox [-acmnopQsh-] [-d dir] [-e ext] [-f descr pattern] [-i file]
      [-I index] [-t title]

   filebox displays an Explorer-style file selection dialog box
   with either an Open or a Save button.  Any files selected are
   written, one per line, to stdout.

Options:

   -a         File must exist.  (Open dialog only.)
   -c         Ask if file is to be created.  (Open dialog only.)
   -e ext     Default extension if none specified.  (Save
              dialog only.)
   -f descr pattern Filename Filter.  If none specified, default
                    is "All Files" = "*.*".
   -F file    Initial filename.
   -i dir     Initial Directory.
   -I index   Initial index in filters.
   -m         Multiple files may be selected.
   -o         Verify Overwrite if Saving (-s).
   -p         Leading path must exist.
   -Q         Quote filenames that contain any of these special
              characters,all of which have significance to the
              C shell:  space, (), [], {}, ~, ; and &.  (The quotes
              can be stripped off using the eval command.)
   -s         Save dialog.
   -t title   Title.
   -h         Help.  (This screen.)
   --         End of options.