How to stop scylla gracefully

Hi,
I installed scylla 5.2.9 on centos 7 as non root and custom directory. I was trying to find a way to stop scylla gracefully instead of using kill command.

Also i want to send the logs to a custom directory. Is there a way or parameter i can do that.

started scylla as below
/opt/scylladb/bin/scylla --io-properties-file=/opt/scylladb/etc/scylla.d/io_properties.yaml --options-file=/opt/scylladb/conf/scylla.yaml

I am working on poc where there are restrictions not to use systemd or systemctl commands.