diff -r 6b45c4c6f56f -r e651000f1ff1 tool/CommandPdos.cpp
--- a/tool/CommandPdos.cpp	Thu Mar 19 08:42:33 2009 +0000
+++ b/tool/CommandPdos.cpp	Thu Mar 19 08:43:05 2009 +0000
@@ -94,6 +94,12 @@
     SlaveList::const_iterator si;
     bool showHeader;
     
+    if (args.size()) {
+        stringstream err;
+        err << "'" << getName() << "' takes no arguments!";
+        throwInvalidUsageException(err);
+    }
+
     m.open(MasterDevice::Read);
     slaves = selectedSlaves(m);
     showHeader = slaves.size() > 1;