Two code snippets from my program:

Code:
show_license()
{
  tail -n 674 -q "$0" | less
}
Code:
    echo "\n"
  fi	
  echo "Press return to go back to the main menu."
done


:<<’LICENSE’

                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies...
This means I can include the license at the end of the source and have a menu option to show it without duplicating or using nasty long strings.

(Just so you know, you don't need a closing LICENSE if the comment block is at the end of the file)