What do you use and how do you sharpen your hooks ?

[SAXATILUS]

Naturally I learned the hard way. Lost a real nice fish one night and the old guy I was with said " Let me see that hook", looks at it , drags it across his finger nail, "it's dull, the bigger they are the harder there mouths are". Now all hooks are sticky sharp all the time. Dr Slick diamond file, best 20 bucks I've spent.