One OCC to maintain them all! Nextcloud, Owncloud-Possible OCC-Wrapper for local installations and Docker-Guests.

occ

#!/usr/bin/env bash

SUDO=''
if [[ $EUID -ne 0 ]]; then
  SUDO='sudo'
fi

if [ -f /var/www/nextcloud/occ ]; then
  COMMAND="/usr/bin/php /var/www/nextcloud/occ"
  if [[ $(whoami) != 'www-data' ]]; then
    COMMAND="sudo -u www-data ${COMMAND}"
  fi
else
  NEXTCLOUD_DOCKERIZED=$($SUDO docker ps --format '{{.Names}}:{{.Image}}' |grep nextcloud | grep -v -E mysql\|mariadb)
  if [ ! -z $NEXTCLOUD_DOCKERIZED ]; then
    NEXTCLOUD_CONTAINER=$(echo $NEXTCLOUD_DOCKERIZED |cut -d":" -f1)
    COMMAND="$SUDO docker exec --user www-data "${NEXTCLOUD_CONTAINER}" php occ"
  fi
fi

${COMMAND} "$@"