- UNIX System Security: A Guide for Users and System Administrators
- O'Reilly® The Complete FreeBSD: Documentation from the Source
- FreeBSD Handbook (Murray Stokely, et al.)
- FreeBSD Developers' Handbook (Danilo G. Baio, et al.)
- Programming Mac OS X with Cocoa for Beginners (Wikibooks)
- O'Reilly® Using C on the UNIX System (David A. Curry)
- The Art of UNIX Programming (Eric Steven Raymond)
- Advanced Linux Programming (Mark L. Mitchell, et al)
- An Introduction to GCC: for the GNU Compilers GCC and G++
- Unix System Programming in OCaml (Xavier Leroy, et al)
- O'Reilly® Linux Device Drivers, 3rd Edition (Jonathan Corbet)
- Beej's Guide to Unix Network Programming (Brian Hall)
- Making Servers Work: A Guide to Linux System Administration
- GNU/Linux Advanced Administration (Remo Boldrito, et al)
- Linux Administration Made Easy (Steve Frampton)
- O'Reilly® Linux Kernel in a Nutshell (Greg Kroah-Hartman)
- The Linux Networking Architecture: Design and Implementation
- Linux Networking (Paul Cobbaut)
- The Book of Webmin: Learned to Stop Worrying and Love UNIX
- TCP/IP Illustrated, Vol. 1: The Protocols (W. Richard Stevens)
- Bourne Shell Scripting (WikiBooks)
- The Linux Command Line: A Complete Introduction (W. Shotts, Jr.)
- Conquering the Command Line: Unix and Linux for Developers
- Advanced Bash-Scripting Guide (Mendel Cooper)
- Bash Guide for Beginners (Machtelt Garrels)
- Ten Steps to Linux Survival: Navigating the Bash Jungle
- LINUX: Rute User's Tutorial and Exposition (Paul Sheer)
- Ubuntu Essentials: A Guide to Ubuntu Desktop and Server
- Ubuntu Pocket Guide and Reference (Keir Thomas)
- Linux From Scratch (Gerard Beekmans, et al)
- Red Hat Enterprise Linux Essentials (Neil Smyth)
- Learning Old School Linux (Ed Hartnett)
- O'Reilly® Linux Network Administrator's Guide, 2nd Edition
- Linux 101 Hacks - Examples to Build a Strong Fundation in Linux