Hello,

On 2019-06-23 9:06 a.m., altear wrote:

If you don't mind, can you tell me how cp and dd works, just in summary, or 
maybe can tell me from which line thats code work?


A nice code overview is available here:
  http://www.maizure.org/projects/decoded-gnu-coreutils/cp.html
  http://www.maizure.org/projects/decoded-gnu-coreutils/dd.html

And code exploration (using OpenGrok) here:
  https://opengrok.housegordon.com/source//xref/coreutils/src/dd.c
  https://opengrok.housegordon.com/source//xref/coreutils/src/cp.c


-assaf




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