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    It's treating your "variables" as strings because that's all sed does - string manipulation. It has no concept of "integer." Commented Apr 20, 2012 at 16:10
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    I'm very curious why you want to use sed to do math Commented Apr 21, 2012 at 13:43
  • I just thought it could easily cast variables, didn't realize was so complex! Commented Apr 22, 2012 at 16:56
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    I'm a little late, but vim users have maybe done math in a search and replace command before and since sed is very similar to vim search and replace, one would assume you could do the same type of stuff with it @DavidOneill Commented Dec 27, 2019 at 18:04