A long time ago, in an operating system far, far away I used a tool
called PCED. It had one really nice feature: If I had typed a command like
copy a b
it saved it, just like bash does. But when I typed
and pressed up-arrow, it would filter the history entries and show only
those that started with "copy".
I'm already using autojump for the cd command. Is there something to
provide this filter on using up-arrow to scroll through past commands?