Guide to Unix
Publisher: Wikibooks 2010
This book is a guide to Unix and Unix-like operating systems, such as GNU/Linux and *BSD. Other systems like Mac OS X, Solaris, and OSF/Tru64 also belong in the list. The book targets multiple audiences: Unix or non-Unix users seeking background, Unix system users (background and user instructions), and Unix system administrators (background and administrator instructions).
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by Jerry Peek - O'Reilly
This book explains how to use, customize, and program with MH electronic mail commands, available on virtually any UNIX system. MH is notable for its flexibility: you'll be able to do things you never thought you could do with an email program.
by IBM Redbooks - IBM
This is a study guide for professionals wishing to prepare for the certification exam to achieve: IBM Certified Specialist - AIX V4.3 System Administration. It helps AIX administrators develop the knowledge and skills required for the certification.
by R. Russell, D. Quinlan, C. Yeoh - Filesystem Hierarchy Standard Group
The filesystem standard has been designed to be used by Unix distribution developers, package developers, and system implementors. However, it is primarily intended to be a reference on how to manage a Unix filesystem or directory hierarchy.
by Chet Ramey, Brian Fox - gnu.org
A description of the features that are present in the Bash shell. GNU Bash is an implementation of the POSIX.2 specification, with additional features from the C-shell and Korn shell. Most Bourne shell scripts can be run by Bash without modification.