On: Zsh is your friend.

[sandGorgon]

about the 3'rd thing, that's not a bash thing - that's a ubuntu thing, which nicely integrates with bash by default. You could get the same thing by putting

function command_not_found_handler() { /usr/bin/python /usr/lib/command-not-found -- $1 }

in your .zshrc

P.S.