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You'd probably have better luck posting this question in the toolshed (in the "General" section"). And to answer your question, yes, I have made a knife out of a reciprocating saw blade. I used to make knives out of all sorts of things when I was a kid and had access to a shop. A reciprocating saw blade is pretty thin for a knife, you won't be able to do much with it. Something somewhat sharp can definitely be made, though.
Reciprocating saw blade knives are balls tough and wicked sharp. The only problem is that the steel is very unforgiving and difficult to work with. I've found blades that were as thick as 3/32" that were suitable for making smaller knives. The guys in the knifemakers forum will tell you everything you'll want to know, plus some things you probably don't want to know.