Fix "grep foo bar" in eshell

* lisp/eshell/em-unix.el (eshell-grep): Use the -H switch so that
we always get the file name, so that `M-x next-error' and friends
work (bug#22330).

diff --git a/lisp/eshell/em-unix.el b/lisp/eshell/em-unix.el
index 153000438e716872aa14df6f33f767bf9828b9a2..c66f307bfeeb33a1eaf6a2c72cacf17d351df25d 100644 (file)
--- a/lisp/eshell/em-unix.el
+++ b/lisp/eshell/em-unix.el
@@ -754,7 +754,7 @@ external command."
                                      (eshell-stringify-list
                                       (flatten-tree args)))
                              " "))
-            (cmd (format "%s -n %s"
+            (cmd (format "%s -nH %s"
                          (pcase command
                            ("egrep" "grep -E")
                            ("fgrep" "grep -F")