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Has thd any vital roles on a Raspbian system?

I've never used this daemon before, and I don't know what it exactly does. I'm preparing a RPi for a remote hosting location, so it will be a headless, SSH only machine.

Is it safe to remove or does it serve any special purpose?

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According to the documentation:

Triggerhappy is a hotkey daemon developed with small and embedded systems in mind, e.g. linux based routers. It attaches to the input device files and interprets the event data received and executes scripts configured in its configuration.

Keyboard volume control is one of the areas where it proves useful, according to this post.

Based on that, it probably won't be of much use for a headless machine...

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    Its incredibly useful on a headless machine, you can plug a controller in and press a button to control it! – Wilf Jul 29 '15 at 19:48

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