my ($a, $op, $b) = @ARGV;
my $res = eval("$a $op $b");
print "$a $op $b = $res\n";

##</code><code>##

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