Are your line endings what you expect (ie. is the file being treated as one long line as opposed to several)? Try this, and see if you get a single line, or all of the lines printed:

perl -lane 'print $_; exit;' input.txt

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

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