all: use grep -E/-F instead of fgrep/egrep

egrep and fgrep are obsolescent now.

This PR updates all egrep and fgrep commands to grep -E and grep -F.
Running egrep/fgrep command with grep v3.8 will output the following warning to stderr:
egrep: warning: egrep is obsolescent; using grep -E

see also:
https://www.phoronix.com/news/GNU-Grep-3.8-Stop-egrep-fgrep
https://lists.gnu.org/archive/html/info-gnu/2022-09/msg00001.html

Change-Id: Iea1ca9ae72264530c67727b5e27cf1b7a362dd97
GitHub-Last-Rev: 3584884bd48cca97271ab86010fce8e4e063c0e4
GitHub-Pull-Request: golang/go#55299
Reviewed-on: https://go-review.googlesource.com/c/go/+/432256
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/buildall.bash b/src/buildall.bash
index 7b3751f42e..e4e3ec37ec 100755
--- a/src/buildall.bash
+++ b/src/buildall.bash
@@ -41,7 +41,7 @@ gettargets() {
 }
 
 selectedtargets() {
-	gettargets | egrep "$pattern"
+	gettargets | grep -E "$pattern"
 }
 
 # put linux first in the target list to get all the architectures up front.