[Newbies] Running Squeak in a Unix shell

Hi,

this a question by a shell noob: How can I use Squeak in a unix shell to run a command such as:

./squeak foo.image bar.st

I would like to do this in my WSL shell (Windows Subsystem for Linux) as well as on Travis.

WSL says:

squeak: cannot execute binary file: Exec format error

Travis (without explicit OS setting, so I'm assuming unix as well) says:

squeak: could not find any display driver

To run a script in headless mode, I should not need any graphical output? How can I achieve this? I would greatly appreciate your help!

Best,

Christoph