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Core Linux (Books & Tutorials)  
Unix Man Pages [Mirror] [Mirror] [Mirror] [Mirror] Frequently Asked Questions about UNiX
O'Reilly® The UNIX CD Bookshelf v3.0 [Mirror] [Mirror] [Mirror]
O'Reilly® The UNIX CD Bookshelf v2.x [Mirror] [Mirror] [Mirror] [Mirror] [Mirror] [Mirror]
O'Reilly® The UNIX CD Bookshelf [Mirror] [Mirror] [Mirror] [Mirror] [Mirror] [Mirror] [Mirror] [Mirror] [Mirror]
O'Reilly® Unix/Linux Books Chapters The Unix-Haters Handbook (PDF)
UNIX Like Filesystem Hierarchy Standard (Rusty Russell, et al) [Mirror] [Mirror]
A Basic UNIX Tutorial [Another] [Another] Introduction to UNIX - the Online Manual [Another]
The Unix Programming Environment (M. Burgess) Introduction to POSIX/UNIX Realtime Programming
Using Samba, 2nd Edition [1st Edition] Teach Yourself Samba in 24 Hours
UNIX Unleashed [Mirror] [Mirror] UNIX Unleashed, Internet Edition [Mirror] [Mirror] [Mirror]
UNIX Unleashed, System Admin's Edition [Mirror] [Mirror] [Mirror] [Mirror] [Mirror]
Unix KornShell Quick Reference Beginner's Guide to Programming on the SUNs
Unix, vi and X-Windows Guide Introduction to Unix for Web Developers
mh-e The Emacs Interface to MH (B. Wohler) Running .NET on Unix - The Mono Handbook
MH & nmh: Email for Users & Programmers (J. Peek)  [Mirror]  [Mirror]  [Mirror]