safe search for text in all files e.g search for clean_up( in all the files recursive.
$ grep -nre clean_up\( --exclude-dir={proc,dev,lib,sys}
search for file and don't get into other filesystems
$ find . -xdev -name file_name*
Run a docker container and get bash
$ docker run -it ubuntu:18.04 bash
Get shell of a running container
$ docker exec -it [container-name/id] bash
Remove all the container images
$ docker rmi -f $(docker images -a -q)
Stop and remove all containers
$ docker stop $(docker ps -a -q)
$ docker rm $(docker ps -a -q)
list all the containers
$ docker container ls -a
Delete container
$ docker rm -v containername