From: OZAWA Sakuro <sakuro@2238club.org>
Date: 2009-11-12T11:58:02+09:00
Subject: Re: Is it a bug?exec "cd"

See the last section of the document below to know why external 'cd' exists.

http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap01.html

A very rare use of it is to test if a directory can be chdir-able.

-- 
OZAWA Sakuro