Personally I would use the option specification that requires an argument, opt=s (instead of leaving it optional, opt:s, as rot earlier). If the option value would be -, then would switch to reading from standard input unconditionally (without using -p function). That special value of opt would be mentioned in the POD.

In reply to Re^3: checking for piped input data by parv
in thread checking for piped input data by Anonymous Monk

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