This forum has quite a few threads on the knife/sword martial arts.
So far, I don't think anybody has owned up to actually using a knife in anger, but there is plenty of historical/theoretical/speculative info to keep you entertained awhile.
A great forum for knife knuts.
When I was in high school I worked part time at a local service station. When I worked late nights I would be alone. I would keep a 1903a3 springfield in a room which held the air compressor right behind the main room.
I was in Pensacola one day and noticed the Army Navy Store on Navy blvd., had a barrel full of bayonettes for only $5 each. I picked a nice one and noticed it was stamped 1919 and figured it would fit the springfield. It was very long, maybe 18" and indeed did fit the springfield. I kept it on the rifle when I had it at the station.
One night two guys came by and bought a pack of cigarettes and paid for it with a $20 bill. They then proceeded to try and pull a short change con on me. The fair was in town and I figured they were carnies.
I told them that I knew the scam and was going to phone the police. They tried to convince me that they had simply made a mistake. One of them then pulled out a large pocketknife and began to clean his fingernails with it. I was very sure he did not pull it to just clean his nails.
I walked into the little room and grabbed the springfield and held the loaded rifle nearly, but not quite pointed at them and told them to leave. They got into their car and backed all the way to the highway then turned and left.
Stay Safe !