From 7bbcd0652164ec9df8c904a07376e20cdf5e5f01 Mon Sep 17 00:00:00 2001
From: Mike Bailey <mike@bailey.net.au>
Date: Wed, 19 Oct 2022 16:51:38 +1100
Subject: [PATCH] egrep is deprecated (reported by @kwiksand)

https://www.gnu.org/software/grep/manual/grep.html

grep-3.8 introduces an obsolescence warning:

    egrep: warning: egrep is obsolescent; using grep -E

We're using `grep -E` now.
---
 lib/stack-functions | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/stack-functions b/lib/stack-functions
index d7f4ab6e..098ea987 100644
--- a/lib/stack-functions
+++ b/lib/stack-functions
@@ -676,7 +676,7 @@ stack-tail() {
   local final_line
   local output
   local previous
-  until echo "$current" | tail -1 | egrep -q "${stack}.*_(COMPLETE|FAILED)"
+  until echo "$current" | tail -1 | grep --extended-regexp --quiet "${stack}.*_(COMPLETE|FAILED)"
   do
     if ! output=$(stack-events "$inputs"); then
       # Something went wrong with stack-events (like stack not known)