No idea if this will help:
$str =~ s/(\r\n|\n\r|\r|\n)/\r\n/sg;

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where \r is a carriage-return and \n is a line-feed. This code will convert every type of line ending to a CR-LF pair.

Update: removed parenthesis from replacement text

In reply to Re^3: problem with 'bare LF' in script by monarch
in thread problem with 'bare LF' in script by powerhouse

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