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To: Andy Farkas <andyf@speednet.com.au>
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Date: Fri, 02 May 2003 18:49:09 -0700
From: Ed Hall <edhall@weirdnoise.com>
cc: Jerry McAllister <jerrymc@clunix.cl.msu.edu>
cc: freebsd-questions@freebsd.org
Subject: Re: Zeros and ones 
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On Sat, 3 May 2003 09:58:11 +1000Andy Farkas <andyf@speednet.com.au> wrote:
> On Fri, 2 May 2003, Jerry McAllister wrote:
> 
> > It is easy and convenient to use /dev/zero to write out a number of
> > zero bytes to somewhere - as in:
> >
> >           dd if=/dev/zero of=zerofile bs=512 count=1770000
> >                 or
> >           dd if=/dev/zero of=/dev/da1 bs=512 count=1770000
> >
> > But, I would like to write all ones - as in 0xff or maybe some
> > other pattern - as if there was a /dev/one also.
> >
> > Is there a nice way to do this using UNIXistic stringing existing
> > stuff together?   Or do I have to write a little piece of code?
> >
> > Thanks for any [positive] suggestions.
> >
> > ////jerry
> 
> Play around with jot(1).
> 

Specifically,

    jot -c -s '' -n {size} {byte} - 0 >file

will output {size} bytes of value {byte} (both values specified in decimal)
into "file".

		-Ed