docker exec

docker exec runs a command in a running container.

docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

Options

`-d`	`--detach`		Detached mode: run command in the background
	`--detach-keys`	`string`	Override the key sequence for detaching a container
`-e`	`--env`	`list`	Set environment variables
	`--env-file`	`list`	Read in a file of environment variables
`-i`	`--interactive`		Keep STDIN open even if not attached
	`--privileged`		Give extended privileges to the command
`-t`	`--tty`		Allocate a pseudo-TTY
`-u`	`--user`	`string`	Username or UID (format: `<name\|uid>[:<group\|gid>]`)
`-w`	`--workdir`	`string`	Working directory inside the container

Use -t and -i to start an interactive shell in a container:

$ docker exec -it ora23c /usr/bin/bash