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An alias also seems like it'd work.

alias egrep='grep -E'

alias fgrep='grep -F'

POSIX requires that aliases be observed in the context of a shell script, but there is a trap here.

When bash is called as /bin/sh, it will be in POSIX mode, and will honor those aliases.

When called as anything else or when otherwise not in POSIX mode, those aliases will fail.

Bash was around for a decade before the POSIX shell standard was defined, so there is legacy baggage.