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I have a file as following:

  cat data.m
  1
  2
  3
  x+y
  2 x + 3 y

So it contains rows containing numeric numbers or expressions, which at this stage is not a column per se but upon substitution of say x=1 and y=2 it will give an output column as:

  cat output.m
  1
  2
  3
  3
  8

I want to save the whole file into this output file after substitution of x and y. Is there any way to do it? The way I was thinking is whether I can loop over the file data.m and in the process substitute x and y. Can anyone help me?

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Block[{x = 1, y = 2},
  Export["out.m", ReadList["data.m"], "Table"]
]

 FilePrint@"out.m"

1
2
3
3
8

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