Friends

Apologies if this has been asked and answered already but I can find no
solutns.

My jackd set up is quite idiosyncratic.  When I plug in my external
sound gear I have to change the connections each time to get sound out. 
I also use a variety of gear from the same computer each with its own
requirements.

I would like to be able to write a script that would start up jackd, set
the default sound IO to use jackd (I am on Ubuntu Studio) start a couple
of other applications and change the connections.

The man page for jackd is not much help.  I have found some pages that
have part of the answer (e.., http://www.64studio.com/node/740) but
surely there is some direct way of manipulating jackd connections
without a mouse and GUI?

Worik