tests: use grep -E instead of obsolescent egrep Testing on Fedora 38 failed with: egrep: warning: egrep is obsolescent; using grep -E The warning comes from https://git.savannah.gnu.org/cgit/grep.git/commit/?id=a9515624709865d480e3142fd959bccd1c9372d1 . For further anecdotal evidence of the change, see https://www.phoronix.com/news/GNU-Grep-3.8-Stop-egrep-fgrep . This reverses the code check that goes back to e7d3b509af8b. grep -E is POSIX, but there is a risk that it doesn't work the same on all platforms - especially older Unix versions. It should however always be possible to put a GNU grep in $PATH before running the tests.

--- a/tests/test-debugcommands.t	Mon Jun 26 11:15:30 2023 +0100
+++ b/tests/test-debugcommands.t	Mon Jun 26 14:34:58 2023 +0200
@@ -576,7 +576,7 @@
 Test debugcolor
 
 #if no-windows
-  $ hg debugcolor --style --color always | egrep 'mode|style|log\.'
+  $ hg debugcolor --style --color always | grep -E 'mode|style|log\.'
   color mode: 'ansi'
   available style:
   \x1b[0;33mlog.changeset\x1b[0m:                      \x1b[0;33myellow\x1b[0m (esc)