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What is /usr/bin/cd for? cd is supposed to be a shell built-in, because running /usr/bin/cd will make another process and that cannot change the current working directory of the shell you are in.

EDIT:

  $ cat /usr/bin/cd
  #!/usr/bin/sh
  builtin cd "$@"


Look, it's 'cperciva!

  $ cat /usr/bin/cd
  #!/bin/sh
  # $FreeBSD: src/usr.bin/alias/generic.sh,v 1.2 2005/10/24 22:32:19 cperciva Exp $
  # This file is in the public domain.
  builtin `echo ${0##*/} | tr \[:upper:] \[:lower:]` ${1+"$@"}




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