2 files changed, 45 insertions, 1 deletions

diff --git a/lisp/dired-aux.el b/lisp/dired-aux.el
index 12a97f8457e..e4547758587 100644
--- a/lisp/dired-aux.el
+++ b/lisp/dired-aux.el
@@ -738,7 +738,7 @@ can be produced by `dired-get-marked-files', for example."
                ;; Drop all ? and * surrounded by spaces and `?`.
                (while (and (string-match regexp res)
                            (dired--star-or-qmark-p res str))
-                 (setq res (replace-match "" t t res 0)))
+                 (setq res (replace-match "" t t res 2)))
                (string-match regexp res))))
   (let* ((on-each (not (dired--star-or-qmark-p command "*" 'keep)))
          (no-subst (not (dired--star-or-qmark-p command "?" 'keep)))
diff --git a/test/lisp/dired-aux-tests.el b/test/lisp/dired-aux-tests.el
new file mode 100644
index 00000000000..9e02af272b6
--- /dev/null
+++ b/test/lisp/dired-aux-tests.el
@@ -0,0 +1,44 @@
+;;; dired-aux-tests.el --- Test suite for dired-aux. -*- lexical-binding: t -*-
+
+;; Copyright (C) 2017 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+(require 'ert)
+(require 'dired-aux)
+
+
+(ert-deftest dired-test-bug27496 ()
+  "Test for http://debbugs.gnu.org/27496 ."
+  (skip-unless (executable-find shell-file-name))
+  (let* ((foo (make-temp-file "foo"))
+         (files (list foo)))
+    (unwind-protect
+        (cl-letf (((symbol-function 'y-or-n-p) 'error))
+          (dired temporary-file-directory)
+          (dired-goto-file foo)
+          ;; `dired-do-shell-command' returns nil on success.
+          (should-error (dired-do-shell-command "ls ? ./?" nil files))
+          (should-error (dired-do-shell-command "ls ./? ?" nil files))
+          (should-not (dired-do-shell-command "ls ? ?" nil files))
+          (should-error (dired-do-shell-command "ls * ./*" nil files))
+          (should-not (dired-do-shell-command "ls * *" nil files))
+          (should-not (dired-do-shell-command "ls ? ./`?`" nil files)))
+      (delete-file foo))))
+
+(provide 'dired-aux-tests)
+;; dired-aux-tests.el ends here