Can't I get a /dev/one?

[William M. Quarles]

Rahul Sundaram wrote:
> On Tue, 13 Jul 2004 19:02:40 -0400, William M. Quarles
> <walrus at bellsouth.net> wrote:
> 
>>Okay, so there is a /dev/zero.  Shouldn't there be a /dev/one, too?  Is
>>there any way that I can fill a file or device full of ones?
> 
> should be pretty easy. just negate the value

So how do I accomplish that?
And once I know how to accomplish that, can I actually work that in to a 
dd command?

Thanks,
William