The Linux Pocket Guide by Daniel J. Barrett is a compact and informative textbook on the subject of operating systems, specifically focusing on Linux. Published by O'Reilly Media, Incorporated in 2012, this trade paperback features 226 pages of essential information for those looking to deepen their understanding of Linux operating systems. With a convenient size of 7 inches in length, 4.2 inches in width, and 0.6 inches in height, this pocket guide is a valuable resource for anyone interested in the world of Linux.