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    The status returned by the last pipe close, backtick
(``) command, successful call to wait() or waitpid(), or from
the system() operator.
  2. or download this
    open my $oldout, '>&STDOUT' or die "Duping STDOUT: $!\n";
open my $olderr, '>&STDERR' or die "Duping STDERR: $!\n";
...
  system('sleep 5');
}
close $log;