To run Loom normally:

java -jar loom.jar

To start Loom with a file

java -jar loom.jar -f="file/path"

To automatically run that file on load

java -jar loom.jar -f="file/path" -r

To run Loom in headless mode (automatic in a headless environment)

java -jar loom.jar -f="file/path" -r -h