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Use `grep -E` over `egrep`
egrep
has been deprecated in GNU grep since version 2.5.3 (2007) and since version 3.8 emits a warning[1]
egrep: warning: egrep is obsolescent; using grep -E
Avoid this warning by following its suggestion.
[1] https://lists.gnu.org/archive/html/info-gnu/2022-09/msg00001.html