I have an Ethereum node running and mining on a terminal in Linux. I want to create a script that will start up the node.sh roughly 2 minutes after startup. My script is in the home/chainskills/private/startnode.sh. I want this to be executed after startup. I have barely any knowledge of Linux. Please help me. I was told to go and create a script in the etc/init.d directory but I don't know how to. I am running this on a Ubuntu 18 on a mini-mac. I have followed the instructions on many pages on how to automate this script. I need to use the init.d and not a cronjob. Please help.