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  1. or download this
    $ strace -p1625
Process 1625 attached - interrupt to quit
select(0, NULL, NULL, NULL, {19943, 944000}
  2. or download this
    use IPC::Run qw(run timeout timer);

my $t = timeout(20000);
my $out;
run(debug => 1, ["/bin/sleep", 5], '>', \$out, $t);
  3. or download this
    $SIG{CHLD} = sub {};
run(["/bin/sleep", 5], timeout(20000));