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  1. or download this
    open( STDOUT, "|-" ) or die ("Can't open standard output: $!\n");
  2. or download this
    my $pid = open( CHILD, "|-" );
unless (defined $pid) {
...
else ($pid) {
   # in child process (will read from STDIN)
}
  3. or download this
    my $output = `program -text -brief clone_error <<EOF
$form
...
clone_from=$clone_from
r
EOF`;