diff --git a/umlgraph b/umlgraph
new file mode 100755
index 0000000..dcc390d
--- /dev/null
+++ b/umlgraph
@@ -0,0 +1,20 @@
+#!/bin/sh
+#
+# Unix shell script to run UMLGraph on the specified base file name
+# For this to work the JDK tools.jar file must be located in the
+# same directory as UmlGraph.jar.  You also need to adjust the path
+# of UmlGraph.jar to the actual path where the jar file is installed.
+#
+# $Id$
+#
+
+if [ x$2 = x ]
+then
+	echo usage: umlgraph base_file_name filetype [umlgraph arguments] 1>&2
+	echo example: umlgraph MyClass png 1>&2
+	echo '(The above will convert MyClass.java into MyClass.png)' 1>&2
+	exit 1
+else
+	java -jar lib/UmlGraph.jar -package $* -output - $1.java |
+	dot -T$2 -o$1.$2
+fi
diff --git a/umlgraph.bat b/umlgraph.bat
index 00485e7..8c3b41f 100755
--- a/umlgraph.bat
+++ b/umlgraph.bat
@@ -1,15 +1,19 @@
 @echo off
 
-rem Run UMLGraph on the specified base file name
+rem Windows batch file to run UMLGraph on the specified base file name
+rem For this to work the JDK tools.jar file must be located in the
+rem same directory as UmlGraph.jar.  You also need to adjust the path
+rem of UmlGraph.jar to the actual path where the jar file is installed.
 
 rem $Id$
 
 if not "%2" == "" goto ok
-echo usage: umlgraph base_file_name filetype [umlgraph arguments]
+echo usage: umlgraph base_file_name filetype [umlgraph arguments] 1>&2
+echo example: umlgraph MyClass png 1>&2
+echo (The above will convert MyClass.java into MyClass.png) 1>&2
 goto end
 
 :ok
-javadoc -docletpath lib/UmlGraph.jar -package -doclet gr.spinellis.umlgraph.doclet.UmlGraph %3 %4 %5 %6 %7 %8 %9 -output %1.dot %1.java
-dot -T%2 -o%1.%2 %1.dot
+java -jar lib/UmlGraph.jar -package %3 %4 %5 %6 %7 %8 %9 -output - %1.java | dot -T%2 -o%1.%2
 
 :end