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sys/plan9
kxxt 84dc82d7e8 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: I0c6b6a039063d6aee94e8500971001996d4e498c
GitHub-Last-Rev: 1eee614766
GitHub-Pull-Request: golang/sys#137
Reviewed-on: https://go-review.googlesource.com/c/sys/+/432835
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-10-06 21:19:17 +00:00
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