[TUHS] Shell control through external commands

Corey Lindsly corey at lod.com
Fri Jul 15 08:47:23 AEST 2016


> 
> At one time they were shell scripts e.g. "exit 0" for "true".
> 
> -- 
> Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will suffer."
> 

Indeed. Here's what they look like in Solaris 8 .. /usr/bin/true is just 
comments.

lod# cat /usr/bin/true
#!/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#       THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T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  "@(#)true.sh    1.6     93/01/11 SMI"   /* SVr4.0 1.4   */


lod# 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#       THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T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


lod# uname -a
SunOS lod 5.8 Generic_108528-05 sun4u sparc SUNW,UltraAX-i2
lod# 


--corey



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