Terminal: save history?

[Benjamin Winkel]

Hi,

sorry, this is somewhat off-topic, but at least it is related to 
Terminal in my case as I use it as my favorite terminal application ;-)

I use to have several terminals open at the same time. Now I would like 
to save the complete history of ALL instances or even better to have it 
logging directly to one or maybe several files. I know that e.g. the 
bash uses a file ".bash_history". But this is only updated if I close 
one instance and only the commands of the closed terminal are saved into 
it.

Is this task even possible with Linux itself or - if not - could You 
implement this functionality into the XFCE Terminal application?

Thanks a lot!

Benjamin