Prefer grep -E/-F to egrep/fgrep

[gnu-emacs] / lisp / eshell / em-unix.el

diff --git a/lisp/eshell/em-unix.el b/lisp/eshell/em-unix.el
index c27c18c52baa2bcdd5384980e11c7eebb3bd5aaa..e40dbded60b6e928aeee0119a83898c55e8ae923 100644 (file)
--- a/lisp/eshell/em-unix.el
+++ b/lisp/eshell/em-unix.el
@@ -748,7 +748,12 @@ external command."
             (cmd (progn
                    (set-text-properties 0 (length args)
                                         '(invisible t) args)
-                   (format "%s -n %s" command args)))
+                   (format "%s -n %s"
+                           (pcase command
+                             ("egrep" "grep -E")
+                             ("fgrep" "grep -F")
+                             (x x))
+                           args)))
             compilation-scroll-output)
        (grep cmd)))))
 
@@ -757,11 +762,11 @@ external command."
   (eshell-grep "grep" args t))
 
 (defun eshell/egrep (&rest args)
-  "Use Emacs grep facility instead of calling external egrep."
+  "Use Emacs grep facility instead of calling external grep -E."
   (eshell-grep "egrep" args t))
 
 (defun eshell/fgrep (&rest args)
-  "Use Emacs grep facility instead of calling external fgrep."
+  "Use Emacs grep facility instead of calling external grep -F."
   (eshell-grep "fgrep" args t))
 
 (defun eshell/agrep (&rest args)