Docker-compose cp
Docker-compose currently does not support cp.
Here is a workaround:
docker cp /path/to/my-local-file.sql "$(docker-compose ps -q mycontainer)":/file-on-container.sql
Now /file-on-container.sql will exist on your running container:
docker-compose exec mycontainer /bin/bash -c 'ls -lah /file-on-container.sql'
-rw-r--r-- 1 root root 244M Nov 14 19:48 /file-on-container.sql