From: Robert Klemme <shortcutter@...>
Date: 2009-11-29T01:05:06+09:00
Subject: Re: Ruby byte access to disk sectors like dd does

On 11/28/2009 01:26 AM, Bill Kelly wrote:

>> The more fun solution would of course be to code the hex dumping in
>> Ruby also. :-)
> 
> :)  Here's a stab at it... (it does work properly if the last
> read returns fewer than 16 bytes.)

What makes it stop working properly if the file size is a multiple of 16?

> ruby -e 'File.open("/dev/hdb", "rb") {|io| print(io.read(512))}' |
>  ruby -e 'i=0; while(x=ARGF.read(16)); puts("%08x %-32s %s" % [i, x.unpack("H*"), x.tr("^\040-\176",".")]); i+=16; end'

Why do you separate this in two processes?  I've munged it a bit...

ruby -e 'File.open("/dev/hdb", "rb"){|io|i=0;while(l=io.read(16));
printf("%06x %-32s %s\n",i,l.unpack("H*").first,l.tr("^\040-\176","."));
i+=l.bytesize end}'


Cheers

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/