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Did you mean the temporary files used for crash recovery with ex editor?
I know next to nothing about "ex", but in order to insert data into a file, the file always must be rewritten from the point of insertion.
Thinking about it a second time, "ex" does not necessarily use an intermediate file. But in that case it should keep the entire original file in memory, and still rewrite the file from the point of insertion (in this case: the entire file).
But as you pointed out, "ex" maintains a recovery file anyway. So I guess it very well possible it uses that instead of keeping everityhing in memory.
Depending on what you are trying to do exactly, but it may be a solution to append the lines to the file. then when you want to read it, use it, or do further processing reverse the lines in the file with the "tac" utility.