Add param check for -c option

UnixBench/Run

@@ -906,6 +906,7 @@ sub parseArgs {
     # Generate the requested list of bench programs.
     my $opt;
     my $word;
+    my $copies;
     while ($word = shift(@words)) {
         if ($word !~ m/^-/) {               # A test name.
             if ($word eq "all") {
@@ -928,7 +929,9 @@ sub parseArgs {
             if (!defined($params->{'copies'})) {
                 $params->{'copies'} = [ ];
             }
-            push(@{$params->{'copies'}}, shift(@words));
+            $copies = shift(@words);
+            abortRun("-c copies should be positive integer") if ($copies !~ m/^\d+$/ || $copies <= 0);
+            push(@{$params->{'copies'}}, );
         } else {
             die("Run: unknown option $word\n");
         }