misc/186495: option to read and write last block of a disk for dd(1)

[Chris Whitehouse]

>Number:         186495
>Category:       misc
>Synopsis:       option to read and write last block of a disk for dd(1)
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Wed Feb 05 20:00:01 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Chris Whitehouse
>Release:        10.0R amd64
>Organization:
Chris Whitehouse
>Environment:
FreeBSD chaos.bikerevolution.co.uk 10.0-RELEASE FreeBSD 10.0-RELEASE #0 r260789: Thu Jan 16 22:34:59 UTC 2014     root at snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
It would be great if dd(1) could read and write the last block of a disk without the user having to calculate blocks. Eg gpt partition schemes store metadata in the last sector. Suggested option could be seek=-1.

>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: