ADVANCED BASH SCRIPTING GUIDE

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Download free Advanced Bash Scripting Guide pdf. A working knowledge of shell scripting is essential to anyone wishing to become reasonably proficient at system administration, even if they do not anticipate ever having to actually write a script. Consider that as a Linux machine boots up, it executes the shell scripts in /etc/rc.d to restore the system configuration and set up services. A detailed understanding of these startup scripts is important for analyzing the behavior of a system, and possibly modifying it.

Table of contents Advanced Bash Scripting Guide

Shell Programming
Starting Off With a Sha-Bang
Invoking the script ~ Preliminary Exercises ~ Basics
Special Characters
Introduction to Variables and Parameters
Variable Subtitution ~ Variable Assigment ~ Bash Variables Are Untyped ~ Special Variable Types
Quoting
Quoting Variable ~ Escaping
Exit and Exit Status
Tests
7.1. Test Constructs ~ File test operators ~ Other Comparison Operators ~ Nested if/then Condition Tests ~ Testing Your Knowledge of Tests
Operations and Related Topics
Operators ~ Numerical Constants
Beyond the Basics
Variables Revisited
Internal Variable ~ Manipulating Strings ~ anipulating strings using awk ~ Further Reference ~ Parameter Substitution ~ Typing variables: declare or typeset ~ Another use for declare ~ Indirect R114 $RANDOM: generate random integer ~ The Double-Parentheses Construct
Loops and Branches
Loops ~ Nested Loops ~ Loop Control ~ Testing and Branching
Command Substitution
Arithmetic Expansion
Recess Time
Commands
Internal Commands and Builtins
Job Control Commands
External Filters, Programs and Commands
Basic Commands ~ Complex Commands ~ Time / Date Commands ~ Text Processing Commands ~ File and Archiving Commands ~ Communications Commands ~ Terminal Control Commands ~ Math Commands ~ Miscellaneous Commands
System and Administrative Commands
Analyzing a System Script ~ Advanced Topics
Regular Expressions
A Brief Introduction to Regular Expressions ~ Globbing
Here Documents
I/O Redirection
Complex Functions and Function Complexities ~ Local Variables ~ Local variables and recursion ~ Recursion Without Local Variables
Aliases
List Constructs
Arrays
/dev and /proc
Of Zeros and Nulls
Debugging
Options
Gotchas
Scripting With Style
Unofficial Shell Scripting Stylesheet
Miscellany
Interactive and non-interactive shells and scripts ~ Operator Precedence ~ Shell Wrappers ~ Tests and Comparisons: Alternatives ~ script calling itself (recursion) ~ "Colorizing" Scripts ~ Optimization ~ Assorted Tips ~ Ideas for more powerful scripts ~ Widgets ~ Security Issues ~ Infected Shell Scripts ~ Hiding Shell Script Source ~ Writing Secure Shell Scripts ~ Portability Issues ~ Shell Scripting Under Windows
Scripting With Style
Unofficial Shell Scripting Stylesheet
Miscellany
Interactive and non-interactive shells and scripts ~ Operator Precedence ~ Shell Wrappers ~ Tests and Comparisons: Alternatives ~ A script calling itself (recursion) ~ "Colorizing" Scripts ~ Optimization ~ Assorted Tips ~ Ideas for more powerful scripts ~ Widgets ~ Security Issues ~ Infected Shell Scripts ~ Hiding Shell Script Source ~ Writing Secure Shell Scripts ~ Portability Issues ~ Shell Scripting Under Windows
Bash, versions 2, 3, and 4
Endnotes
Bibliography
Appendix A. Contributed Scripts
Appendix B. Reference Cards
Appendix C. A Sed and Awk Micro-Primer
Appendix D. Exit Codes With Special Meanings
Appendix E. A Detailed Introduction to I/O and I/O Redirection
Appendix F. Command-Line Options
Appendix G. Important Files
Appendix H. Important System Directories
Appendix J. History Commands
Appendix K. A Sample .bashrc File
Appendix L. Converting DOS Batch Files to Shell Scripts
Appendix M. Exercises