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in reply to Re^2: One-liner only checking the first line of the input file
in thread One-liner only checking the first line of the input file

Do this:

perl -anE '/(\R)/; say unpack("H*", $1);' input.txt

It appears as your file is being read as one long string. If you're on *nix, your output should be 0a per line for as many lines you have in the file. Post what the output shows.