[newbie] more books please

[Marco Paśl Mancheno Herrera]

Hi...
  I need free books (I hope in pdf or ps) about "Programing with Shell in 
Linux" and "Operating System"

  This books are for my class at the University, and I'll be grateful a lot 
if you can help me

thanks 4 everything
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       | M. Paśl Mancheno H. |
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