diff --git a/bin/showports b/bin/showports
new file mode 100755
index 0000000..9e58fb6
--- /dev/null
+++ b/bin/showports
@@ -0,0 +1,12 @@
+#!/bin/sh
+if [ "$1" == "-h" ] ; then
+	echo "$0 [port]"
+	exit 1
+fi
+
+if [ "$1" != "" ] ; then
+	FILT="-iTCP:$1"
+else
+	FILT="-iTCP"
+fi
+lsof -nP $FILT | grep LISTEN