docker-exec

#!/usr/bin/env bash

errorTooManyArguments="Input Error: too many arguments given." #1

errorDockerNameNotGiven="Input Error: container name not given." #2
errorCommandNotGiven="Input Error: command not given." #3
errorDockerNameNotFound="Docker Error: container name not found." #4
errorDockerNameNotSpecific="Docker Error: found multiple containers containing given name, be more specific." #5

#input check
if [ $# -eq 0 ]; then
  echo $errorDockerNameNotGiven
  exit 2
elif [ $# -eq 1 ]; then
  echo $errorDockerNameNotGiven
  exit 3
elif [ $# -gt 2 ]; then
  echo $errorTooManyArguments
  exit 1
fi

#grab conatiner id
containerId=$(docker ps -qf name=${1})

#check if container name exists
if [ -z $(echo -e ${containerId} | tr -d "[:space:]") ]; then
  echo $errorDockerNameNotFound
  exit 4
fi

#check if container name was too general
if [ $(echo ${containerId} | grep -o " " | wc -l) -gt 1 ]; then
  echo $errorDockerNameNotSpecific
  exit 5
fi

docker exec -it $containerId sh -c "${2}"