prezto/directory.zsh

setopt AUTO_CD              # Auto cd to a directory without typing cd.
setopt AUTO_PUSHD           # Push the old directory onto the stack on cd.
setopt PUSHD_IGNORE_DUPS    # Don't store duplicates in the stack.
setopt PUSHD_SILENT         # Do not print the directory stack after pushd or popd.
setopt PUSHD_TO_HOME        # Push to home directory when no argument is given.
setopt CDABLE_VARS          # Change directory to a path stored in a variable.
setopt AUTO_NAME_DIRS       # Auto add variable-stored paths to ~ list.
setopt MULTIOS              # Write to multiple descriptors.
setopt EXTENDED_GLOB        # Use extended globbing syntax.
unsetopt CLOBBER            # Don't overwrite existing files with > and >>.
                            # Use >! and >>! to bypass.

# Aliases
for index in {1..9}; do
  alias "$index"="cd +${index}"
done
unset index