These utilities can only function correctly if implemented as shell
builtins and exist only because POSIX previously required them.  As of
POSIX 2024, they have all been reclassified as intrinsic utilities and
are no longer required to exist in PATH.  We can therefore retire them.
Cf. XBD 1.7, XRAT C.1.8, Austin Group bug 854.

Note that kill(1) is also considered an intrinsic utility (because
only the shell can interpret job IDs correctly), but we have a working
standalone implementation, which we will keep.

PR:		291686
Relnotes:	yes
Reviewed by:	imp, emaste
Differential Revision:	https://reviews.freebsd.org/D54239

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

For meta mode we will want objdirs.

Differential Revision:	D2748
Reviewed by:	brooks imp

These are specified by POSIX but are not special builtins, and therefore
need to be available via execve() and utilities like time, nohup, xargs.
(Note that hash was moved from the XSI option to the base in the 2008
standard.)

Like most of the POSIX "regular builtin commands", these need to be executed
in a shell environment for full functionality, although they may still be of
some use outside one.

Unlike the POSIX special and regular builtin commands, POSIX does not
require these to be found before a PATH search, although that could be an
oversight.

Like some of the utilities already provided by usr.bin/alias, these may lead
to confusing results when invoked from csh(1).

OK'ed by:	core

Submitted by:	Udo Schweigert <Udo.Schweigert@siemens.com>

implement any of the useless POSIX-required ``regular shell builtin''
utilities, saving one frag and one inode each.  The script moves to
usr.bin/alias which is alphabetically the first of these commands.