cheat sheets.

Control-A   Beginning of Line
Control-E   End of Line
Control-W   Delete Word
Control-B   Back a Character
Control-F   Forward a Character
Escape-B    Back a Word
Escape-F    Forward a Word
Escape-.    Cycles back through previous arguments
Control-K   Clear line after cursor
Control-U   Clear line before the cursor
Control-L   Clear screen, but keep current line

To turn on vi key bindings:

set -o vi

To turn on emacs key bindings:

set -o emacs