Index: cli/cli-decode.c
===================================================================
RCS file: /cvs/src/src/gdb/cli/cli-decode.c,v
retrieving revision 1.119
diff -u -p -r1.119 cli-decode.c
--- cli/cli-decode.c	24 Apr 2013 14:29:17 -0000	1.119
+++ cli/cli-decode.c	28 Aug 2013 14:00:46 -0000
@@ -1729,7 +1729,7 @@ lookup_cmd_composition (const char *text
 	  *cmd = find_cmd (command, len, cur_list, 1, &nfound);
 	}
       
-      if (*cmd == CMD_LIST_AMBIGUOUS)
+      if (nfound > 1)
 	{
 	  return 0;              /* ambiguous */
 	}
Index: testsuite/gdb.python/py-parameter.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.python/py-parameter.exp,v
retrieving revision 1.8
diff -u -p -r1.8 py-parameter.exp
--- testsuite/gdb.python/py-parameter.exp	1 Jan 2013 06:41:26 -0000	1.8
+++ testsuite/gdb.python/py-parameter.exp	28 Aug 2013 14:00:46 -0000
@@ -29,6 +29,13 @@ if { [skip_python_tests] } { continue }
 # We use "." here instead of ":" so that this works on win32 too.
 gdb_test "python print (gdb.parameter ('directories'))" "$srcdir/$subdir.\\\$cdir.\\\$cwd"
 
+#Test command ambiguousness
+gdb_test "python gdb.parameter('print symbo on')" \
+"Traceback.*File.*line 1.*RuntimeError.*Could not find parameter.*print symbo on.*Error while executing Python code.*" \
+"set print symbo on"
+gdb_test "show print symbo" "Ambiguous show print command \"symbo\".*" \
+"show print symbo"
+
 # Test a simple boolean parameter.
 gdb_py_test_multiple "Simple gdb booleanparameter" \
    "python" "" \