On an EBCDIC system, the line endings are probably "\r" and "\n", of course. And there is no point in using "\x0a" and "\x0c" in the previous code. The only use for "\x0a" and "\x0d" are when you might run under MacOS and are using something like a network protocol that requires "\r\n". MacOS made the mistake of changing the definition of "\r" and "\n" rather than translating them. All other system that use non-Unix line endings, _translate_ to/from "\n".
If it weren't for MacOS, "\r" and "\n" would always be the right choice. The move toward "\x0a" and "\x0c" has been motivated by trying to be portable with MacOS and has caused great confusion. Since very few Perl programmers actually work on the even weirder systems like those that use EBCDIC, the folly of this has not been widely noted (CGI.pm is one of the few places that I've seen start to notice this).
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tye
(but my friends call me "Tye")
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