That's part wrong, part outdated.

• In the situation where "\r\n" ends up being "\015\015\012" (when using :crlf), so will "\015\012".
• "\012\012\015" should read "\012\015", and that only occurs on MacPerl (Perl for Macs earlier than OS X).

On all current operating systems, "\015" is interchangeable with "\r" and "\012" is interchangeable with "\n".

(Well, not on EBCDIC systems. But it's not clear to me how you'd want the program to behave there in this case.)

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