A little bit more thought has resulted in a generic script which can

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.

usr.bin/Makefile

@@ -7,7 +7,8 @@
 # XXX Use GNU versions: apropos bc dc diff grep ld man patch whatis
 # Moved to secure: bdes
 #
-SUBDIR=	apply \
+SUBDIR=	alias \
+	apply \
 	asa \
 	at \
 	awk \
@@ -20,7 +21,6 @@ SUBDIR=	apply \
 	calendar \
 	cap_mkdb \
 	catman \
-	cd \
 	chat \
 	checknr \
 	chflags \
@@ -33,7 +33,6 @@ SUBDIR=	apply \
 	colrm \
 	column \
 	comm \
-	command \
 	compile_et \
 	compress \
 	csplit \

usr.bin/alias/Makefile

@@ -0,0 +1,19 @@
+# $FreeBSD$
+
+SCRIPTS=generic.sh
+SCRIPTSNAME=cd
+NOMAN=
+
+LINKS=	${BINDIR}/alias ${BINDIR}/bg \
+	${BINDIR}/alias ${BINDIR}/cd \
+	${BINDIR}/alias ${BINDIR}/command \
+	${BINDIR}/alias ${BINDIR}/fc \
+	${BINDIR}/alias ${BINDIR}/fg \
+	${BINDIR}/alias ${BINDIR}/getopts \
+	${BINDIR}/alias ${BINDIR}/jobs \
+	${BINDIR}/alias ${BINDIR}/read \
+	${BINDIR}/alias ${BINDIR}/umask \
+	${BINDIR}/alias ${BINDIR}/unalias \
+	${BINDIR}/alias ${BINDIR}/wait
+
+.include <bsd.prog.mk>

usr.bin/alias/generic.sh

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

usr.bin/cd/Makefile

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

usr.bin/command/Makefile

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

usr.bin/command/command.sh

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