Move dropbox directory on Linux using the command line

Short Answer

You can't.  All the stuff on the internet is real old.   I worked on this for 10 hours and here is my answer.

How to get the directory where you want

This is only really useful if you want to move the dropbox directory to a filesystem other then the one your users are on.

Create a user whose home directory is where you want the Dropbox directory to be.  The Dropbox directory is going to end up under this user's home directory.  

Why is this better then a symbolic link?

It is better than a symbolic link since because Dropbox uses OS level file notifications calls to decide what to sync.  These do not work through a symbolic link.  If you just make a link called Dropbox and point it to another filesystem your files will not be synced.  You can change and create files through a symbolic link.  Dropbox needs to have a real link to work.