cd Options

autocd

• if a directoryname is entered like a command, and there is no command of that name; the 'cd' command is executed for that directory

auto_pushd

• make cd push the old directory to the dirstack

cdable_vars

• if cd would fail, because the arg is not a dir, try to expand the argument as if it was called the ~expression way

pushd_ignore_dups

• don't push dups on the dirstack

pushd_to_home

• make 'pushd' with no argument, act like pushd ${HOME}