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z/OS V1R4.0 MVS System Messages, Vol 3 (ASB-BPX)
IBM
z/OS V1R5.0 DFSMShsm Managing Your Own Data
z/OS V1R6.0 DFSORT Messages, Codes and Diagnosis Guide
Pro Git
Scott Chacon & Ben Straub
The Linux Command Line: A Complete Introduction
William E. Shotts, Jr.
The GNU Make Book
John Graham-Cumming
Absolute FreeBSD, 3rd Edition: The Complete Guide to FreeBSD
Michael W. Lucas
Absolute OpenBSD, 2nd Edition: UNIX for the Practical Paranoid