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  1. or download this
    my $pid = open2(\*OUT, \*IN, '| findstr hello');
                              ^
  2. or download this
    my $pid;
eval {
...
if ($@ and $@ =~ /^open2:/) {
    die "$@: $!\n";
}
  3. or download this
    > perl 729630.pl
open2: exec of NotThere ... failed at 729630.pl line 8
: No such file or directory