Two aspects you might want to consider

• writing to a temporary output file (as done in your example) might lead to troubles with write-access-rights
• writing to a temporary output file is helpful when debugging, as that file can be checked easily afterwards outside of perl (unless you delete it)

In my projects, I have no real preference. I typically decide it case-base-case based on the "feeled risk of needing debugging info"

HTH, Rata

Update: Oooops! I have overlooked the pipe-symbol. So please ignore my answer above! Thanks for pointing this out, BrowserUk!

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