Is it possible to run multiple simulations sequentially?

Gatling (Open-Source)
1

This is the current scenario: I am testing multiple related servers. I decided to create one simulation for each; however, now it makes more sense to run all simulations at once rather than running them one by one.

Is this possible to do with Gatling through the command line?

2

No.

You can run concurrent scenarios inside a same simulation.
Running simulations sequentially is a job for a wrapping script or a scheduler.