My workaround to clear cache via CLI is create a bash script like this:
#!/bin/bash
WEBDIR=/var/www/html/
RANDOM_NAME=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 13)
echo "<?php opcache_reset(); ?>" > ${WEBDIR}${RANDOM_NAME}.php
curl http://localhost/${RANDOM_NAME}.php
rm ${WEBDIR}${RANDOM_NAME}.php
put it in /usr/local/bin/opcache-clear and make it executable.
When I want to clear cache I simply run "opcache-clear" inside terminal.