prevent duplicate output for -I | --head #3
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A compromise solution for #2 - if the user is running
-I | --headat the terminal, stdout is discarded to prevent the duplicate output; however if the user is piping or redirecting the output, stdout is preserved to maintain compatibility.I looked into rewriting
-Iinto-X HEADbut curl behaves differently by waiting for content to be sent. More info I couldn't figure out a good workaround..