[Bug 274280] Incompatible default shell configuration

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274280

--- Comment #1 from Jilles Tjoelker <jilles@FreeBSD.org> ---
The reasoning for exporting ENV was to make sure interactive non-login shells
have the user's settings such as aliases and shell options, while not extending
the startup files from the POSIX standard. However, this indeed has the problem
that the ENV file must be readable by all POSIX-style shells.

Perhaps the cleanest solution is to read, in interactive shells, a file with
some hard-coded name from the user's home directory if ENV is not set. In an
interactive login shell, this file would be read after .profile (if .profile
did not set ENV). The standard dot.profile can then be changed to stop setting
ENV.

The hard-coded name could be something like .shrc or something new like
.freebsdshrc.

By the way, bash's decision to use the ENV file only when it is invoked as sh
or in POSIX mode (in either case, only in interactive shells, as specified by
POSIX) helps it here.

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