As an alternative to your approach, you might want to look into PerlIO, in particular the :crlf layer, which is responsible for Perl's different handling of newlines on Windows vs. Unix:

:crlf
A layer that implements DOS/Windows like CRLF line endings. On read converts pairs of CR,LF to a single "\n" newline character. On write converts each "\n" to a CR,LF pair. (...)

By default, that layer is active on Windows perls, but nothing is keeping you from using the layer on Unix to read Windows-style text files, or removing the layer on Windows to write Unix-style files.

In reply to Re: Problems with changing $/ and Tie::File in RO mode (:crlf) by almut
in thread Problems with changing $/ and Tie::File in RO mode by Ooops

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