Shell in Docker

gistfile1.txt

;;; repl.sh

#!/bin/bash

if [[ "$#" -ne 1 ]]; then
    echo "Usage: repl.sh 'script to be run'"
    exit 1
fi

screen -AdmS 'main' "$1"
screen -S 'main' -X screen bash -l
screen -r 'main'

;;; Dockerfile
;;; (...)

RUN apt-get install -y screen
RUN chmod u+s /usr/bin/screen ; chmod 755 /var/run/screen

ADD ./run.sh /var/run.sh
ADD ./repl.sh /var/repl.sh
CMD ["/var/repl.sh", "/var/run.sh"]