C Library Reference for UNIX System V.4 (with ANSI C)

The Unix C Shell Field Guide by Gail Anderson: Used

Unix for Real-Time Control: Problems and Solutions

Using C with Curses, Lex and Yacc : Building a Window Shell for UNIX System V by

TCP/IP Illustrated: Volume 3 TCP Transactions HTTP NNTP Unix Domain Protocols

Hayden Books Unix System Library: UNIX Shell Programming

Programming with Curses: Unix C Library for Screen Manipulation by Strang, John

Harley Hahn's Student Guide to Unix by Harley Hahn (1996, Trade Paperback)