Run different hsqldb databases

I have different projects using hsqldb with slightly different tables and I want to have different databases for them. After I found out how to run hsqldb on Mac OS X, it turns out quite straightforward to do so.

What the windows runner of hsqldb runServer.bat does is going to the data folder and run the server there. Then the server will create and save all data in this data folder.

cd ..\data
@java -classpath ../lib/hsqldb.jar org.hsqldb.server.Server %1 %2 %3 %4 %5 %6 %7 %8 %9

So my new script make a new folder under each project named db or whatever and go into it then run the server. All projects can now have their own hsqldb databases.
mkdir db
cd db
java -cp path/to/hsqldb/lib/hsqldb.jar org.hsqldb.server.Server

I name this script and put it in my workspace then in each project I run ../ If I do need some new porject have the same data to start with I only need to copy the db folder.