Re: [sr #110657] Autoconf configure script considers absence of usable grep a fatal error, although it only uses egrep thereafter

A related data point:  the grep and egrep supplied with SunOS 4.1.1_U1
(which IIRC is somewhere between 4.2 and 4.3 BSD) both accept -e.
However, if -e is specified more than once, they appear to use only
the last occurrence.  (I had expected that egrep, at least, would
report all input lines that match any of multiple -e specifications.)

BTW they are separate executables, neither of which accepts -E.