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Re^2: 3 questions... 2 about newlines, and one on how to be NICE

by Eimi Metamorphoumai (Deacon)
on Jan 10, 2005 at 17:07 UTC ( #421001=note: print w/ replies, xml ) Need Help??


in reply to Re: 3 questions... 2 about newlines, and one on how to be NICE
in thread 3 questions... 2 about newlines, and one on how to be NICE

While we're quoting from perldoc, here's part of perldoc perlop:

All systems use the virtual "\n" to represent a line terminator, called a "newline". There is no such thing as an unvarying, physical newline character. It is only an illusion that the operating system, device drivers, C libraries, and Perl all conspire to preserve. Not all sys- tems read "\r" as ASCII CR and "\n" as ASCII LF. For example, on a Mac, these are reversed, and on systems without line terminator, print- ing "\n" may emit no actual data. In general, use "\n" when you mean a "newline" for your system, but use the literal ASCII when you need an exact character. For example, most networking protocols expect and prefer a CR+LF ("\015\012" or "\cM\cJ") for line terminators, and although they often accept just "\012", they seldom tolerate just "\015". If you get in the habit of using "\n" for networking, you may be burned some day.
So in other words, use "\n" for your local system's view of a newline, or use actual characters if you know what you want, regardless of what system you're running on.


Comment on Re^2: 3 questions... 2 about newlines, and one on how to be NICE
Re^3: 3 questions... 2 about newlines, and one on how to be NICE
by ryantate (Friar) on Jan 10, 2005 at 20:35 UTC
    Just to complicate things further, please note that this is out of date and somewhat inaccurate. When perldoc says "on a Mac," it means "on a Mac running the Macintosh operating system up through version 9." Mac OS X (version 10) and newer use Unix-style newlines.

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