Re: [tlug] binary search of binary data

[Dave Brown <dagbrown@example.com>]

On Wed, Dec 29, 2004 at 11:50:51PM +0900, Edward Wright wrote:
> I don't know how to make prinf output the byte values. It'll ouput the
> hex representation no problem....
> 
> I tried using it to create the above mentioned file like so:
> 
> printf $'\x26\x9d\x00\x00\x28\x9d\x00\x00' >testfile

Why try so hard?  Why not just use echo?

:) [~] echo -n $'\x26\x9d\x00\x00\x28\x9d\x00\x00' | od -t x1
0000000 26 9d 00 00 28 9d 00 00
0000010
:) [~] 

> but I ended up with a 2 byte file.... apparently it quit when it hit
> the null byte.... which kinda makes sense.

Yeah, that's because, I suppose, printf is just a wrapper around
the C function call, which (natch) uses C strings.

> (I tried the same thing as an argument to grep, but it also
> failed - probly for the same reason)

That kinda surprises me, and I'd say it's probably worth a bug
report to the GNU grep folks.

--Dave