do you know how to make an init.d script to start squeak each time a linux server starts... It's for seaside. For now I use a command line squeak -nodisplay myImage.image but when I close the shell, squeak stops too
I think you just have to look at different exemples of scripts in init.d/ to understand how to make one. Basically, a simple switch/case statement that handles start|stop|restart could be enough.
To make a software stay alive after an exit of the owner, you should call it with 'nohup':
# nohup squeak -nodisplay myImage.image
Bye