Run Drush on all Multisites Script

drush-all.sh

  SITES="docroot/sites"

  # Validate and hint if no argument provided.
  if [ "${#}" -eq 0 ]; then
    echo "- drush-all: missing argument(s)"
    echo "EXAMPLE: drush-all cex -y"
  else
    PWD=${PWD}
    cd "${SITES}"
    # Loop:
    for SITE in $(ls -d */ | cut -f1 -d'/'); do
      # Skip default site.
      if [ ! "${SITE}" == "default" ]; then
        cd "${PWD}"
        echo "drush -l ${SITE} ${@}"
        drush -l "${SITE}" "${@}"
      fi
    done
  fi

On Acquia run with:
source ./drush-all.sh {drush command}