I have AS Perl 5.8.9 (build 827) on Windows Vista and Windows XP. Piped input is read by the Perl program on Vista but is not read by the same Perl program on XP, even though Perl programs can be run implicitly on both Vista and XP by just entering the program name on the command line.

Following is the command line I am using and the Perl program I am piping input to. This is a simplified example to show the difference between how Vista and XP handle piped input. I am grepping all lines of a file (the test program in this case, but it could be any file) with the '-n' option to precede each line with a line number and colon. The output of grep is piped to the Perl program where the colon following the line number is removed and the line is printed.

Note: I found that if I use '... | perl test.pl' instead of '... | test.pl' on XP it will read the piped input, but I do not believe I should have to do that to make it work. Does anyone have any ideas why piped input is not read on XP? Thanks.

grep -n "^" test.pl | test.pl

#!/usr/bin/perl
# Perl program test.pl
use strict;
use warnings;

while ( <> ) {
   chomp;
   s/:/ /;
   print "$_\n";
}
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