> I have a number of projects (about 50) which I want to
> update once a week.  There's no inbuilt functionality for
> this so I want to script it (ksh).  I cant seem to work
> out how to call the command line version so it picks up
> the preferences from that the gui version saved..

Well, this is on the TODO list, but not yet built-in.

You may try something like:
cd /home/foobar/myprojects
find . -type d -exec sh -c '(cd {} && httrack --update --
quiet)' \;

Do some tests, but make a backup first of your projects :)