docker Performs a command operation outside a container inside a container

Sometimes we want to execute a command in a container, but we don't want to enter the container. So what should I do?

So the script can be written like this

#!/bin/bash
DOCKER_ID=62f3f40ab240
sudo docker exec -it $DOCKER_ID /bin/bash -c 'cd /packages/detectron && python tools/train.py'

done

Additional knowledge: Solve the problem of seamless call of shell commands between docker container and host

I won't talk too much, let's see the solution ~

nsenter -t 1 -m -u -n -i sh -c "echo hello world! "

(docker container plus privilege permissions, set pid: "host")