What skills should I cultivate do learn to be a sysadmin as a back up job opportunity?
Doing a PhD in humanities and enjoy it. I’ve recently really started to enjoy Linux, self hosting, and messing around with various lab stuff.
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Programming is the biggest skill you can learn, as it helps with automation and separates you from install clickers. You don't have to be advanced, just the basics helps troubleshooting when you understand how software flows from the inside.
Sysadmin and programming are different skill sets. I have yet to see a person that can do both reasonably well.