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Re: Perl binmode problem on text mount


On Wed, 3 Nov 2004, Earl Chew wrote:

> This code used to work on Perl 5.6.1-2 on Cygwin 1.3.10.
>
> I've now moved to Perl 5.8.5-3 on Cygwin 1.5.11.
>
> Here is the Perl program:
>
> 	binmode STDOUT;
> 	print "Hello\n";
>
> 1. Output to file on text mount
>
> 	perl foo.pl > foo.txt ; od -c foo.txt
>
> 	0000000  H e l l o \r \n	# Perl 5.8.5-3 Cygwin 1.5.11
> 	0000000  H e l l o \n		# Perl 5.6.1-2 Cygwin 1.3.10
>
> 2. Output to file via cat
>
> 	perl foo.pl | cat > foo.txt ; od -c foo.txt
>
> 	0000000  H e l l o \n		# Perl 5.8.5-3 Cygwin 1.5.11
> 	0000000  H e l l o \n		# Perl 5.6.1-2 Cygwin 1.3.10
>
> Has anyone else experienced the same issue?

This is expected behavior.  Unless you use raw writes (as "cat" does), the
mode of the file (text or binary) is determined *by the program that opens
the file*.  In the above case, the program is not perl, it's your shell.

You can try one of a few things: either set PERLIO to ":raw" (I guess
":unix" should also work) before invoking perl, or make perl open the file
itself instead of relying on shell redirection, or use the cat trick, or
use a binary mount...  Since you mentioned perl-5.6.1, setting PERLIO
would probably be the best way to approximate the behavior.  For more
details on PERLIO, see "man perlrun".
	Igor
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