Prefer grep -E/-F to egrep/fgrep

POSIX marked egrep and fgrep as legacy apps in SUSv2 (1997) and
withdrew them in SUSv3 (2001), and these days grep -E and grep -F
are probably more portable.
* lib-src/etags.c (main):
* lisp/eshell/em-unix.el (eshell-grep, eshell/egrep)
(eshell/fgrep):
* lisp/cedet/semantic/symref.el (semantic-symref-find-text):
* lisp/eshell/esh-var.el (eshell-apply-indices):
* lisp/progmodes/ada-xref.el (ada-xref-search-with-egrep)
(ada-find-in-src-path):
* lisp/textmodes/ispell.el (ispell-grep-command):
(ispell-lookup-words):
Use or document grep -E and grep -F instead of egrep and fgrep.
* lisp/textmodes/ispell.el (ispell-grep-options):
Use -Ei on all platforms, not just MS-Windows.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib-src/etags.c b/lib-src/etags.c
index 01e230206ac..e8b71e6b96a 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -1343,7 +1343,7 @@ main (int argc, char **argv)
     {
       char *cmd =
         xmalloc (strlen (tagfile) + whatlen_max +
-                 sizeof "mv..OTAGS;fgrep -v '\t\t' OTAGS >;rm OTAGS");
+                 sizeof "mv..OTAGS;grep -Fv '\t\t' OTAGS >;rm OTAGS");
       for (i = 0; i < current_arg; ++i)
         {
           switch (argbuffer[i].arg_type)
@@ -1356,7 +1356,7 @@ main (int argc, char **argv)
             }
           char *z = stpcpy (cmd, "mv ");
           z = stpcpy (z, tagfile);
-          z = stpcpy (z, " OTAGS;fgrep -v '\t");
+          z = stpcpy (z, " OTAGS;grep -Fv '\t");
           z = stpcpy (z, argbuffer[i].what);
           z = stpcpy (z, "\t' OTAGS >");
           z = stpcpy (z, tagfile);