how to catch tab button in shell line?

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http://stackoverflow.com – I want create a script with default arguments, of manner how some commands display default arguments pressing tab button in linux In first instance I want to catch the tab button with the command trap, but it is not a correct way since the tab button shall trapped by the shell before to execute the script and no after the questions are, How catch the tab button in the shell before execute the program and display the default arguments than can get the script or program? Have a demon, bind key,or config file that allow to pass default arguments to shell line? Note: I regularly use bash (HowTos)