A file works too, even an angle grinder, but not as well
I used to have two hardened steel sharpening guides, one of them a great Buck HoneMaster, lost long ago in a move, in a box that neve5r made it to the new place. (GRR!)
Now I make do with flimsy, shaky plastic cheap things.
Oh, well, that made me learn to hold knives more steadily by hand.
DMT Knife Sharpening Guide
With a magnetic dingus added, and a video: