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freebsd-update: use grep -E instead of egrep

Description

freebsd-update: use grep -E instead of egrep

GNU egrep emits a warning that it is obsolescent and suggests grep -E
instead. Switch to grep -E in case we end up invoking GNU (e)grep (and
for consistency with other invocations in this file).

Reported by: Steffen Nurpmeso
Sponsored by: The FreeBSD Foundation

Details

Provenance
emasteAuthored on Mar 2 2023, 11:54 PM
Parents
rG3518a5bbd9bb: netgraph.4: remove obsolete ng_atm.4 reference
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