From 564d45b5a55adeb48f69fdecb2bf4ed1f909850b Mon Sep 17 00:00:00 2001
From: Dan Cross <cross@gajendra.net>
Date: Tue, 22 Jul 2025 14:42:03 +0000
Subject: config: add $egrep

Introduce a new variable set in $PLAN9/config:
$egrep, which is conditionally set to either
`egrep` or `grep -E`, based on platform, and use
this when we want to invoke `egrep`.

This works around the endless warnings from GNU
grep stating that `egrep` is deprecated in favor
of `grep -E`, when run on e.g. Linux.
---
 src/cmd/rc/checkparse | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/cmd/rc/checkparse')

diff --git a/src/cmd/rc/checkparse b/src/cmd/rc/checkparse
index 0a1472b2..4ddd0910 100755
--- a/src/cmd/rc/checkparse
+++ b/src/cmd/rc/checkparse
@@ -1,5 +1,13 @@
 #!/bin/bash
 
+egrep=egrep
+tag="${SYSNAME:-`uname`}"
+case "$tag" in
+*Linux*)
+	egrep='grep -E'
+	;;
+esac
+
 aflag=false
 if [ "$1" = -a ]; then
 	aflag=true
@@ -10,7 +18,7 @@ files="$@"
 if [ $# = 0 ]; then
 	files=$(echo ./test.rc;
 		grep -l '^#!/usr/local/plan9/bin/rc' /usr/local/plan9/bin/{*,*/*} 2>/dev/null;
-		grep -R -l '^#!/bin/rc' $HOME/pub/plan9 | egrep -v 'plan9/(lib/(oui|pci)|sys/man|sys/lib/man|sys/lib/scsicodes)' 2>/dev/null)
+		grep -R -l '^#!/bin/rc' $HOME/pub/plan9 | $egrep -v 'plan9/(lib/(oui|pci)|sys/man|sys/lib/man|sys/lib/scsicodes)' 2>/dev/null)
 fi
 
 for i in $files
-- 
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