tablc.icn: Program to tabulate characters in a file

   This program tabulates characters and lists each character and
the number of times it occurs. Characters are written using
Icon's escape conventions.  Line termination characters and other
control characters are included in the tabulation.

Options: The following options are available:

     -a   Write the summary in alphabetical order of the charac-
          ters. This is the default.

     -n   Write the summary in numerical order of the counts.

     -u   Write only the characters that occur just once.