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Comment by tutipop | Hacker News Reader

I do the same in bash, but it's a bit wordier:

  _chpwd_hook() {
    if [[ "$PWD" != "$PREVPWD" ]]; then
      ls
      PREVPWD="$PWD"
    fi
  }

  PROMPT_COMMAND=(_chpwd_hook)

Goes well with

  shopt -s autocd
  alias r='cd -'

Not strictly equivalent, but shorter (and should work with multiple shells):

  $ cd() { builtin cd $* && ls; }
  $ cd /
  bin  boot cdrom  dev  etc  home  lib  lib64 [...]

$* will break on directory names containing spaces and other bash "word" delimiters, use "$@":

    cd() { builtin cd "$@" && ls; }