used Transformers::make_checksum. Changed option to --query-id

bin/pt-kill

@@ -7102,10 +7102,10 @@ sub main {
                   $query->{Id}, ($query->{Command} || 'NULL'), $query->{Time},
                   ($query->{Info} || 'NULL');
             }
-            if ( $o->get('fingerprint') ) {
+            if ( $o->get('query-id') ) {
                   my $fp = $qr->fingerprint($query->{'Info'});
-                  my $chksm = uc substr(md5_hex($fp), -16);
-                  print "Fingerprint: 0x$chksm\n";
+                  my $chksm = Transformers::make_checksum($fp);
+                  print "Query ID: 0x$chksm\n";
             }
             if ( $o->get('execute-command') ) {
                exec_cmd($o->get('execute-command'));
@@ -7493,11 +7493,6 @@ pt-kill does not provide any safeguards so code carefully!
 
 It is permissible for the code to have side effects (to alter C<$event>).
 
-=item --fingerprint
-
-Prints a fingerprint (checksum) of the query that was just killed. This is 
-equivalent to the fingerprint output of pt-query-digest. This allows 
-cross-referencing the output of both tools.
 
 =item --group-by
 
@@ -7602,6 +7597,20 @@ short form: -P; type: int
 
 Port number to use for connection.
 
+=item --query-id
+
+Prints an ID of the query that was just killed. This is 
+equivalent to the "ID" output of pt-query-digest. This allows 
+cross-referencing the output of both tools.
+
+Example:
+
+   Query ID 0xE9800998ECF8427E
+
+Note that this is a digest (or hash) of the query's "fingerprint", 
+so queries of the same form but with different values will have the same ID.
+See pt-query-digest for more information.
+
 =item --run-time
 
 type: time

t/pt-kill/match.t

@@ -137,14 +137,14 @@ like(
    "--match-all"
 );
 
-# --fingerprint option 
+# --query-id option 
 $output = output(
-   sub { pt_kill::main(@args, "$trunk/t/lib/samples/pl/recset011.txt", qw(--match-all --print --fingerprint)); }
+   sub { pt_kill::main(@args, "$trunk/t/lib/samples/pl/recset011.txt", qw(--match-all --print --query-id)); }
 );
 like(
    $output,
    qr/0x69962191E64980E6/,
-   '--fingerprint'
+   '--query-id'
 );
 
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