Free Computer, Mathematics, Technical Books and Lecture Notes, etc.
The Linux Command Line: A Complete Introduction (W. E. Shotts, Jr.)
This book takes you from your very first terminal keystrokes to writing full programs in Bash, the most popular Linux shell.
UNIX / Linux Korn Shell Quick Reference Guide
A concise guide to Korn Shell in a single compact handbook. No more need to fumble through oversize volumes for quick reference lookups. Includes plenty of examples to save users even more time.
Learn Vimscript the Hard Way (Steve Losh)
This book will introduce you to Vimscript, the main programming language used to customize Vim. You’ll be able to mold Vim into an editor suited to your own personal text editing needs and make the rest of your time in Vim more efficient.
Gawk: Effective AWK Programming (Arnold D. Robbins)
This book introduces the awk programming language, going into depth to explain the many features of the language and its syntax, and detailing the various GNU extensions.
GNU Bash Reference Manual (Chet Ramey and Brian Fox)
This book is the definitive reference for GNU Bash, the standard GNU command-line interpreter.
Advanced Bash-Scripting Guide (Mendel Cooper)
This book is both a tutorial and a reference on shell scripting with Bash. It assumes no previous knowledge of scripting or programming, but progresses rapidly toward an intermediate/advanced level of instruction.
Bash Guide for Beginners (Machtelt Garrels)
This guide discusses concepts useful in the daily life of the serious Bash user. It assumes no previous knowledge of scripting or programming.
Teach Yourself Shell Programming in 24 Hours (Veeraraghavan)
This book is aimed at assisting Unix and Linux users to get optimal performance out of their systems. It shows them how to take control of their systems and work efficiently by harnessing the power of the shell to solve common problems.
O'Reilly® Learning the Korn Shell, 2nd Edition (Arnold Robbins)
This book shows you how to use the Korn shell as a user interface and as a programming environment.
O'Reilly® sed & awk, 2nd Edition (Dale Dougherty, Arnold Robbins)
sed & awk describes two text processing programs that are mainstays of the UNIX programmer's toolbox. This book covers features of sed and awk that are mandated by the POSIX standard.
Unix/Linux Shell Scripting
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