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  1. or download this
      system("foo") == 0 or die "foo failed; rc=$?";

...
  # ... do something with FOO ...
  close FOO;
  ($? == 0) or die "sub-process `command' failed; rc=$?";
  2. or download this
    $h=$ENV{HOME};my@q=split/\n\n/,`cat $h/.quotes`;$s="$h/."
."signature";$t=`cat $s`;print$t,"\n",$q[rand($#q)],"\n";