To find out the start command for mysqld (using a mac) I can do:
ps aux|grep mysql
I get the following output, which allows me to start mys
To stop autostart of mysql on boot, the following worked for me with mysql 8.0.12 installed using Homebrew in macOS Mojave 10.14.1:
8.0.12
macOS Mojave 10.14.1
rm -rf ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist