I was wondering while developing some application (though this is not a development question) if the cd command used in Windows is a wildcard or cross-platform command of sorts. I looked up on table with comands for Unix/Linux and MAC OS X and it turns out that it seems to be there. I am not a multi-os user, so I ask if anyone with experience in different OSes can tell me:

1. If this command really exists and works
2. If it has the same functionality (change directory)
3. If there are any problems with its use
4. If in any OS there is another command-line command that does the same in a better/more elaborate/more frequetly used way.

Thanks in advance!

(P.S.I am not 100% sure if this question belongs to this site or some other stackexchange site...)

(P.P.S Any help in tagging this will be appreciated!)