[clug] using 'dd' in a pipeline

Scott Ferguson scott.ferguson.clug at gmail.com
Mon Nov 24 01:29:47 MST 2014

>> On 24 Nov 2014, at 6:50 pm, John Mills <johnmi at effect.net.au> wrote:
> On 24/11/14 19:03, steve jenkin wrote:
>> Can you point out where the variable 'blocks' is set in your script?

> It wasn’t. 

> good catch.

Indeed - I missed that, though I had thought of suggesting, as a matter
of practise, that you either change the case or variables - or change
the name re:conflict between variables, built-ins and system commands
e.g. size

Another thought I considered mentioning - is that jpegs contain all
sorts of problematic characters[*1], of special note may be those that
can be conflated with end of record and end of file.

[*1]hence my suggestion to search for the traditional jpeg end of image
characters - which is not perfect e.g. when dealing with compression
and/or thumbnail inserts.

> I was using command line directly to create the script fragment and didn’t create & properly test the script.

Kind regards

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