Simple script to Start, Stop an Update Portainer running in Docker under Linux and OS X

portainer.sh

#!/usr/bin/env bash

CONTAINER_NAME="portainer"
IMAGE_NAME="portainer/portainer-ce"
PORT=9000
DATA_DIR="/opt/portainer/data"

function container-exist() {
  local CONTAINER_ID=${1}
  docker inspect "${CONTAINER_ID}" &> /dev/null
  return $?
}
function is-container-running() {
  local CONTAINER_ID=${1}
  local RUNNING=$(docker inspect --format '{{ .State.Running }}' "${CONTAINER_ID}")
  if [[ "${RUNNING}" == "true" ]]; then
    return 0
  else
    return 1
  fi
}

function create-data-repo() {
  if [ ! -d "${DATA_DIR}" ]; then
    echo "We need to create a directory to store portainer data."
    sudo mkdir -p "${DATA_DIR}"
  fi
}


function launch() {
  if ! container-exist ${CONTAINER_NAME}; then
    create-data-repo
    docker run --name ${CONTAINER_NAME} --volume "/var/run/docker.sock:/var/run/docker.sock" --volume /opt/portainer/data:/data --detach --restart unless-stopped --publish $PORT:9000 $IMAGE_NAME
  elif ! is-container-running ${CONTAINER_NAME}; then
    create-data-repo
    docker start ${CONTAINER_NAME}
  fi
  # local IP_ADDRESS=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' "${CONTAINER_NAME}")

  if [ "$(uname)" == "Darwin" ]; then
    open "http://localhost:${PORT}/" > /dev/null 2>&1
  else
    xdg-open "http://localhost:${PORT}/" > /dev/null 2>&1
  fi
}

function stop() {
  if is-container-running "${CONTAINER_NAME}"; then
    docker stop "${CONTAINER_NAME}"
  fi
}

function update() {
  docker pull ${IMAGE_NAME}
  docker stop ${CONTAINER_NAME}
  docker rm ${CONTAINER_NAME}
  launch
}

function main() {
  if [ $# -eq 1 ]; then
    ACTION=${1^^}
  else
    ACTION="START"
  fi

  if [[ "${ACTION}" == "STOP" ]]; then
    stop
  elif [[ "${ACTION}" == "UPDATE" ]]; then
    update
  elif [[ "${ACTION}" == "START" ]]; then
    launch
  else
    echo "Unknown command ${ACTION}"
    echo "Usage: $(basename "${0}") START|UPDATE|STOP"
    exit -2
  fi
}

main $@

for last docker image you have to use : portainer/portainer-ce:latest

Corrected, thank you!