Not so much programming than Sysadmin, but "Unix and Linux System Administration Handbook" by Evi Nemeth, Garth Snyder, Trent R. Hein, Ben Whaley and Dan Mackin

Not so much programming than Sysadmin, but "Unix and Linux System Administration Handbook" by Evi Nemeth, Garth Snyder, Trent R. Hein, Ben Whaley and Dan Mackin. It's a huge book covering a lot of ground, while on the same time being very approachable for anyone with some experience of linux trying to go further, and last but not least it's extremely enjoyable to read. This book makes you feels like you're in same room as very fun and knowledgeable people showing you the ropes. It's colorful, and not afraid to be opinionated sometime.