Strange command prompt behavior of cd

I've tried this in CentOS 5.6 and Debian 6.02, both guests running under VirtualBox 4.04, and it works in both.

If you type cd /开发者_如何转开发/, it takes you to root like normal, but the pwd is //. Other than that, everything is like a regular root. You can traverse the filesystem like normal, but as long as all the paths you enter are relative, the double // will remain. What's going on here?

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You've probably using bash. At least on my system bash behaves as you've described.

While trying it in zsh and tcsh pwd was / as expected. So I guess it some sort of bash only "problem".

Note: if you do cd /// than pwd is /. So it looks like a "bug" in bash.

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From the accepted answer at the link given by delnan:

A pathname that begins with two successive slashes may be interpreted in an implementation-defined manner, although more than two leading slashes shall be treated as a single slash.

Looks like it's a part of the Single Unix Spec.

http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap04.html#tag_04_11