{
  local @SIG{'INT', 'TERM'} = (sub {warn 'Interrupt!'}) x 2;
  `$cmd -P ALL $interval >> $path`;
}
[download]

This works the way I pictured it to, thank you! But for some reason it doesn't work for this one.

{
  local @SIG{'INT', 'TERM'} = (sub {warn 'Interrupt!'}) x 2;
  `$cmd -P ALL $interval | timestamp.pl >> $path`;
}
[download]

Processing mpstat-5_EDT
Number of samples: 9

Processing iostat-5_EDT
Number of samples: 50

Processing vmstat-5_EDT
Number of samples: 0
[download]

And VM stat is the only one that runs with timestamp.pl