mjhjmtu

I installed the latest GNU/Bash and gnu coreutils on Mac, additionally, the PATH and MANPATH are reseted.

$ bash --version
GNU bash, version 4.4.23(1)-release (x86_64-apple-darwin18.0.0)
Copyright (C) 2016 Free Software Foundation, Inc.
$ which ls
/usr/local/opt/coreutils/libexec/gnubin/ls
$ echo $PATH
/usr/local/opt/coreutils/libexec/gnubin:
$ echo $MANPATH
/usr/local/opt/coreutils/libexec/gnuman:/usr/local/opt/coreutils/libexec/gnuman:

I can refer to GNU Manual for some utilities

$ man sort
$ man ls

but when it come to shell built-in commands

$ man read

BUILTIN(1) BSD General Commands Manual BUILTIN(1)

NAME
 builtin, !, %, ., :, @, , , alias, alloc, bg, bind, bindkey, break, breaksw, builtins, case,
 cd, chdir, command, complete, continue, default, dirs, do, done, echo, echotc, elif, else, end,
 endif, endsw, esac, eval, exec, exit, export, false, fc, fg, filetest, fi, for, foreach, getopts,
 glob, goto, hash, hashstat, history, hup, if, jobid, jobs, kill, limit, local, log, login,
 logout, ls-F, nice, nohup, notify, onintr, popd, printenv, pushd, pwd, read, readonly, rehash,
 repeat, return, sched, set, setenv, settc, setty, setvar, shift, source, stop, suspend, switch,
 telltc, test, then, time, times, trap, true, type, ulimit, umask, unalias, uncomplete, unhash,
 unlimit, unset, unsetenv, until, wait, where, which, while -- shell built-in commands

BSD February 23, 2005 BSD

The invoked read comes from the system outdated shell

$ which read
/usr/bin/read

I do install the latest shell, why it prompt me the 2005 version builtins.