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Asked: 2026-06-18T20:31:12+00:00

I got an argument parser working using getOpt which is great, but I do

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I got an argument parser working using getOpt which is great, but I do have one question. When using ReqArg in an option like:

Option ['c'] ["config"] (ReqArg (\f opts -> opts { configFile = f }) "FILE")
                     "use a custom configuration file"

what does it use that second argument for (in this case, "FILE")? I have not experienced any kind of difference in behavior when specifying another string.

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1 Answer

  1. Editorial Team

    It’s for the auto-generated usage message. Same with OptArg. Run usageInfo on your OptDescr list and see what comes back.

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