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14.4 Readline Support
=====================

If 'gawk' is compiled with the GNU Readline library
(http://cnswww.cns.cwru.edu/php/chet/readline/readline.html), you can
take advantage of that library's command completion and history
expansion features.  The following types of completion are available:

Command completion
     Command names.

Source file name completion
     Source file names.  Relevant commands are 'break', 'clear', 'list',
     'tbreak', and 'until'.

Argument completion
     Non-numeric arguments to a command.  Relevant commands are 'enable'
     and 'info'.

Variable name completion
     Global variable names, and function arguments in the current
     context if the program is running.  Relevant commands are
     'display', 'print', 'set', and 'watch'.