Use the "builtin" shell function to make sure that the requested

command is handled as a shell function.  This avoids the following
peculiar behaviour when /usr/bin is on a case-insensitive filesystem:
    # READ foo
(... long pause, depending upon the amount of swap space available ...)
    sh: Resource temporarily unavailable.

Reported by:	I can't remember; someone on IRC.
MFC after:	1 week

usr.bin/alias/generic.sh

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