For comparison, here is /usr/bin/false from my Solaris box: $ cat /usr/bin/false #!/usr/bin/sh # Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T

For comparison, here is /usr/bin/false from my Solaris box: $ cat /usr/bin/false #!/usr/bin/sh # Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T # All Rights Reserved # THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T # The copyright notice above does not evidence any # actual or intended publication of such source code. #ident "@(#)false.sh 1.6 93/01/11 SMI" /* SVr4.0 1.3 */ exit 255 You'll notice the slight difference with `true`.