Is it possible to execute a script with only editing/remove/making files

Just curious,

Would you be able to run a script (let's say test.sh) without every doing ./test.sh? You can only edit/make/remove files. A few things I thought about:

• crontab, and then add a line with the current "time + 1 minute" and the script. But crontab doesn't have a file at a location that you can edit, instead you have to edit it with crontab -e which is a command, so this one isn't an option.
• .service file, make a service that runs the script, but then you'd have to do systemctl daemon-reload && systemctl start service to start the service, so this one also isn't an option.

Do you have an idea?