Example for using entrypoints on docker containers

hello-entry-point.sh

#!/usr/bin/env bash

#set -x

[[ $(docker ps --all --filter=name=example-ps -q) ]] && exit

# create local files for coping on docker container
echo '#!/bin/sh

echo "Hello, Entrypoint"
for dir in $(ls /root/daemons/*); do 
    sh $dir &
done

yes > /dev/null' > init.sh

echo '#!/bin/sh

filename=$(basename $0)
sectemp=${filename#daemon}

while [ 1 ]; do
    echo ${filename%.sh}
    sleep ${sectemp%.sh}
done' >  daemon.sh

daemons_fmt=daemons/daemon
mkdir -p daemons

chmod +x init.sh daemon.sh

for i in $(seq 3); do
    cp daemon.sh ${daemons_fmt}${i}.sh
done

# create docker container run and remove it
docker create -it --name example-ps --entrypoint="/root/init.sh" busybox:1.29
docker cp init.sh example-ps:/root
docker cp daemons example-ps:/root
docker start --interactive example-ps
docker rm -f example-ps