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# Set low priority (nice value) for this process...
setpriority( "PRIO_PROCESS", 0, 10 );
...
  # some more code ...
  sleep(300); # it's good to take a nap in the middle of a hard work!
}

$"=q;grep;;$,=q"grep";for(`find . -name ".saves*~"`){s;$/;;;/(.*-(\d+)
+-.*)$/;
$_=["ps -e -o pid | "," $2 | "," -v "," "];`@$_`?{print"+ $1"}:{print"
+- $1"}&&`rm $1`;
print$\;}