Famous Perl One-Liners Explained, Part V: Text conversion and substitution

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February 12, 2010, 16:18

The whole area of line endings is a lot more complex than this article implies. The \n character represents whatever is the end-of-line character on your current system. Therefore when running on Windows, \n actually represents a sequence of two characters - a carriage return character (x0D) followed by a line feed character (x0A).

For this reason, best practice is to use real character codes rather than escape characters. I recommend:

s/\015\012/\012/ # Windows -> Unix
s/\012/\015\012/ # Unix -> Windows

See the section on newlines in "perldoc perlport" for more details.

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