=== modified file 'lisp/dired-x.el'
--- lisp/dired-x.el	2012-09-25 04:13:02 +0000
+++ lisp/dired-x.el	2012-12-06 13:47:11 +0000
@@ -1114,6 +1114,7 @@
     (if (null default)
         ;; Nothing to guess
         (read-shell-command prompt nil 'dired-shell-command-history)
+      (setq prompt (replace-regexp-in-string ": $" " " prompt))
       (if (listp default)
           ;; More than one guess
           (setq default-list default
@@ -1124,7 +1125,7 @@
         ;; Just one guess
         (setq default-list (list default)))
       ;; Put the first guess in the prompt but not in the initial value.
-      (setq prompt (concat prompt (format "[%s] " default)))
+      (setq prompt (concat prompt (format "[%s]: " default)))
       ;; All guesses can be retrieved with M-n
       (setq val (read-shell-command prompt nil
                                     'dired-shell-command-history