Get the size of each file in a folder
ls -lh /path/to/your/directory
ls for list, -l for file-related parameters, permissions, modification time and name, -h for human readable
Get the size of a file
ls -lh /path/to/your/file
Go to the terminal of a Docker container
docker exec -it my_container_id bash
docker exec, the docker command to enter a running docker instance
-i stands for interactive
-t stands for ttv, which is a terminal, like a command line prompt.