its free from publisher directly
http://www.oreilly.com/programming/free/ten-steps-to-linux-survival.csp?intcmp=il-prog-free-product-na_new_site_10_steps_to_linux_survival_text_cta
The bundle as a whole seems to contain normal, paid books.
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There's a new Humble book bundle and this book comes free using the form below the page.
https://www.humblebundle.com/books/unix-book-bundle
I also suggest this bundle for Linux enthusiasts. O'Reilly books are really good for studying. I use them when I study for certification exams.
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