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I am glad I have not kept a count of how many times I have broken ssh in my life. My reaction to this is visceral apprehension. "I've triple checked it, what could go wrong?"
Advice: backup the file and set a cron to revert to the backup in an hour. If it still works, cancel the cron.
ouch no backup way in? most hosts have a serial console or rescue image or something you can boot to to fix this kind of thing. onsite technicians fixing software problems is very 90s/early 2000s
It's a dedicated server so the only way to boot a rescue OS is in-person (afaik).
depends on the provider, but that may well be true for your provider yeah
