Thanks for that. I don't use dropbox so have no concept of how (or not) they might have munged that. Instead, here are some hashes of my input.txt which works:

Compare one of those with the hash of your source and see if/how it differs. I'm using unix EOLs and am including the blank line in the middle.

In reply to Re^3: One-liner only checking the first line of the input file by hippo
in thread One-liner only checking the first line of the input file by TJCooper

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