in reply to My sub does not work twice
It looks like each of your run of job_selection() is overwriting the output file (">" in your open). Is that what you mean by "does not work"? also you are using "our" in your code, which does not seem necessary, "my" should be enough, and you don't need to declare them at the top.
update ok, didn't see the output file name contains a variable.
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