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diff --git a/Ruby/rb_who.d b/Ruby/rb_who.d
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+#!/usr/sbin/dtrace -Zs
+/*
+ * rb_who.d - trace Ruby line execution by process using DTrace.
+ *            Written for the Ruby DTrace provider.
+ *
+ * $Id: rb_who.d 49 2007-09-17 12:03:20Z brendan $
+ *
+ * This traces Ruby activity from all Ruby programs on the system that are
+ * running with Ruby provider support.
+ *
+ * USAGE: rb_who.d 		# hit Ctrl-C to end
+ *
+ * FIELDS:
+ *		PID		Process ID of Ruby
+ *		UID		User ID of the owner
+ *		LINES		Number of times a line was executed
+ *		FILE		Pathname of the Ruby program
+ *
+ * Filenames are printed if available.
+ *
+ * COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
+ *
+ * CDDL HEADER START
+ *
+ *  The contents of this file are subject to the terms of the
+ *  Common Development and Distribution License, Version 1.0 only
+ *  (the "License").  You may not use this file except in compliance
+ *  with the License.
+ *
+ *  You can obtain a copy of the license at Docs/cddl1.txt
+ *  or http://www.opensolaris.org/os/licensing.
+ *  See the License for the specific language governing permissions
+ *  and limitations under the License.
+ *
+ * CDDL HEADER END
+ *
+ * 09-Sep-2007	Brendan Gregg	Created this.
+ */
+
+#pragma D option quiet
+
+dtrace:::BEGIN
+{
+	printf("Tracing... Hit Ctrl-C to end.\n");
+}
+
+ruby*:::line
+{
+	@lines[pid, uid, copyinstr(arg0)] = count();
+}
+
+dtrace:::END
+{
+	printf("   %6s %6s %10s %s\n", "PID", "UID", "LINES", "FILE");
+	printa("   %6d %6d %@10d %s\n", @lines);
+}