Bash question

[Jason Clinton]

   I've ready through the entire bash man page (holy shit!) and I even
   have a the O'Reilly book on bash and I can't find reference to this
   feature anywhere. I stumbled on to the ability to hit page up or down
   after the first few characters of a command to jump back and form
   between .bash_history entries that match. All my other linux boxen
   have not change, however, on my desktop system, suddenly, PGUP and
   PGDN jump to the beginning and end of the .bash_history file,
   respectively. I would really like full command autocompletion back.
   Anyone know what might have been changed?
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