Question: How do I make the file into the shape of a knife.
Options:
Draw the pattern of your knife on the side of the file and use a hacksaw to cut into the proper shape.
Draw the pattern of your knife on the side of the file and use a bench grinder to grind it to the proper shape.
Answer: Draw the pattern of your knife on the side of the file and use a bench grinder to grind it to the proper shape.