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Re^2: Pattern Matching in Cygwin Perl vs. Win32 Perl

by ggvaidya (Pilgrim)
on Aug 27, 2008 at 04:57 UTC ( #707073=note: print w/replies, xml ) Need Help??


in reply to Re: Pattern Matching in Cygwin Perl vs. Win32 Perl
in thread Pattern Matching in Cygwin Perl vs. Win32 Perl

chomp removes anything which is in $/, which is set to "\n" by default. So it ought to remove both CR and LF on Windows, I think.
  • Comment on Re^2: Pattern Matching in Cygwin Perl vs. Win32 Perl

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Re^3: Pattern Matching in Cygwin Perl vs. Win32 Perl
by Anonymous Monk on Aug 27, 2008 at 05:57 UTC
    So it ought to remove both CR and LF on Windows, I think.

    Isn't it better to know?

    C:\>perl -le"print $/" | od -tacx1 0000000 cr nl cr nl \r \n \r \n 0d 0a 0d 0a 0000004 C:\>perl -le"print unpack q,H*,,$/" | od -tacx1 0000000 0 a cr nl 0 a \r \n 30 61 0d 0a 0000004 C:\>
    Furthermore, perlport says
    In most operating systems, lines in files are terminated by newlines. +Just what is used as a newline may vary from OS to OS. Unix tradition +ally uses \012, one type of DOSish I/O uses \015\012, and Mac OS uses + \015. Perl uses \n to represent the "logical" newline, where what is logical + may depend on the platform in use. In MacPerl, \n always means \015. + In DOSish perls, \n usually means \012, but when accessing a file in + "text" mode, STDIO translates it to (or from) \015\012, depending on + whether you're reading or writing. Unix does the same thing on ttys +in canonical mode. \015\012 is commonly referred to as CRLF.
Re^3: Pattern Matching in Cygwin Perl vs. Win32 Perl
by ysth (Canon) on Aug 27, 2008 at 09:52 UTC
    But "\n" is not both CR and LF. It is a single character, and is LF on almost all systems. On Windows, it can be translated to and from CRLF when reading/writing a file, but that happens during the IO, not at any other time.

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