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z/OS V2R1.0 ISPF Reference Summary
IBM
HZSPD101
AIX 5L Version 5.3 Technical Reference: Kernel and Subsystems, ...
Wicked Cool Shell Scripts, 2nd Edition: 101 Scripts for Linux, ...
Dave Taylor & Brandon Perry
UNIX and Linux System Administration Handbook
Evi Nemeth & Garth Snyder & Trent R. Hein & Ben Whaley & Dan Mackin
The Linux Programming Interface: A Linux and UNIX System Programming ...
Michael Kerrisk
The Linux Command Line: A Complete Introduction
William E. Shotts, Jr.
The GNU Make Book
John Graham-Cumming
FreeBSD Device Drivers: A Guide for the Intrepid
Joseph Kong
Absolute OpenBSD, 2nd Edition: UNIX for the Practical Paranoid
Michael W. Lucas
Absolute FreeBSD, 3rd Edition: The Complete Guide to FreeBSD