Humble Bundle Books (PCDD): Linux & UNIX by O’Reilly from $1

Pay $15 or more to unlock all of them.
$1 unlocks:
Classic Shell Scripting – First Edition
Linux Device Drivers – Third Edition
Introducing Regular Expressions – First Edition
grep Pocket Reference – First Edition
Learning GNU Emacs – Third Edition
Unix Power Tools – Third Edition
$8 unlocks:
Learning the bash Shell – Third Edition
Learning the vi and Vim Editors – Seventh Edition
Linux in a Nutshell – Sixth Edition
sed & awk – Second Edition
$15 unlocks:
bash Cookbook – Second Edition
Linux System Programming – Second Edition
Mastering Regular Expressions – Third Edition
Effective awk Programming – Fourth Edition
Linux Pocket Guide -Third Edition
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