run bash in docker container matching given string

docker-bash.sh

#!/bin/bash

name="${1?needs one argument}"
containerId=$(docker ps | grep $name | grep -o '^\w\+')

if [ $(echo $containerId | wc -w) -gt 1 ];
then
  echo "Multiple docker containers found for: $name"
  exit 1
fi

if [[ -n "$containerId" ]]; then
    docker exec -it $containerId /bin/bash
else
    echo "No docker container with name: $name is running"
fi