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for japhy:

=-> cat test.pl
my($plaintext,$html);
$plaintext = ">> foo";

pipe(READ, WRITE);

print "about to open\n";

open WRITE, "| cat";
print WRITE $plaintext;
print "\njust wrote\n";
close WRITE;

print "\nclosed\n";

{ local $/; $html = <READ>; }
close READ;

print "\njust read\n";

print "\$html: $html\n"

=-> perl test.pl
about to open

just wrote
>> foo
closed

just read
$html:
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#!/usr/bin/perl -w
use strict;
 
BEGIN {
package Date::Year1984;
use vars qw(@ISA);
require Tie::Handle;
@ISA = qw(Tie::StdHandle);
 
sub samecase {
  my($what,$pat) = @_;
  $what = lc $what;
  for my $i (0..length($pat)-1) {
    substr($what,$i,1) = uc substr($what,$i,1)
      if substr($pat,$i,1) eq uc substr($pat,$i,1);
  }
  return $what;
}
sub filter { 
  s/\b4\b/5/g, s/\b(four)\b/samecase("five",$1)/ieg for @_; 
}
 
sub WRITE {
    my @x = @_;
    filter($x[1]);
    Tie::StdHandle::WRITE(@x);
}
 
 
tie *STDOUT, 'Date::Year1984', '>&STDOUT';
tie *STDERR, 'Date::Year1984', '>&STDERR';
 
$SIG{__DIE__} = sub { local @_ = @_; &filter; die(@_); };
$SIG{__WARN__}= sub { local @_ = @_; &filter; warn(@_) };
} # end of BEGIN{}
 
package main;
 
print "2 + 2 = 4.\n";
 
warn "2 + 2 = 4 not 5!\n";
die "saying two and two makes FOUR! (I love Big Brother!)\n";
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