only check arg number at all when not "$-"

modules/commands/__init__.py

@@ -69,15 +69,14 @@ class Module(ModuleManager.BaseModule):
             if match.group(1):
                 index = int(match.group(1))
                 continuous = match.group(2) == "-"
-            else:
-                index = -1
-                continuous = True
-
                 if index >= len(args_split):
                     raise IndexError("Unknown alias arg index")
+            else:
+                index = 0
+                continuous = True
 
             if continuous:
-                replace = " ".join(args_split[min(index, 0):])
+                replace = " ".join(args_split[index:])
             else:
                 replace = args_split[index]
             s = s.replace(match.group(0), replace)