POSIX requires these shell builtins to also exist as totally pointless

external commands.  Since they serve no useful purpose, it's OK that their
implementation is not the most efficient possible.

usr.bin/Makefile

@@ -20,6 +20,7 @@ SUBDIR=	apply \
 	calendar \
 	cap_mkdb \
 	catman \
+	cd \
 	chat \
 	checknr \
 	chflags \
@@ -32,6 +33,7 @@ SUBDIR=	apply \
 	colrm \
 	column \
 	comm \
+	command \
 	compile_et \
 	compress \
 	csplit \

usr.bin/cd/Makefile

@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+SCRIPTS=cd.sh
+NOMAN=
+
+.include <bsd.prog.mk>

usr.bin/cd/cd.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+# $FreeBSD$
+# This file is in the public domain.
+cd ${1+"$@"}

usr.bin/command/Makefile

@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+SCRIPTS=cd.sh
+NOMAN=
+
+.include <bsd.prog.mk>

usr.bin/command/command.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+# $FreeBSD$
+# This file is in the public domain.
+command ${1+"$@"}