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Abs guide 3 Advanced Bash ??Scripting Guide A complete guide to shell scripting using Bash Mendel Cooper Brindlesoft thegrendel theriver com Revision History Revision June Revised by mc Initial release Revision October Revised by mc Bugs ?xed plus much ad

Advanced Bash ??Scripting Guide A complete guide to shell scripting using Bash Mendel Cooper Brindlesoft thegrendel theriver com Revision History Revision June Revised by mc Initial release Revision October Revised by mc Bugs ?xed plus much additional material and more example scripts Revision February Revised by mc Another major update Revision July Revised by mc More bug ?xes much more material more scripts ?? a complete revision and expansion of the book Revision September Revised by mc Major update Bug ?xes material added chapters and sections reorganized This is an major update of version The main feature of this release is a major reorganization of the document into parts and chapters just like a real book Of course more bugs have been swatted and additional material and example scripts added This project has now reached the equivalent of a ??page book See the Change log ?le for a revision history This document 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 The exercises and heavily ??commented examples invite active reader participation This project has evolved into a comprehensive book that compares favorably with any of the shell scripting manuals in print It may serve as a textbook a manual for self ??study and a reference and source of knowledge on shell scripting techniques The latest version of this document as an archived tarball including both the SGML source and rendered HTML may be downloaded from the author's home site CDedication For Anita the source of all the magic CAdvanced Bash ??Scripting Guide Table of Contents Chapter Why Shell Programming Chapter Starting O ? With a Sha ??Bang Invoking the script Shell wrapper self ??executing script Part Basics Chapter Exit and Exit Status Chapter Special Characters Chapter Introduction to Variables and Parameters Variable Substitution Variable Assignment Special Variable Types Chapter Quoting Chapter Tests Test Constructs File test operators Comparison operators binary Nested if then Condition Tests Chapter Operations and Related Topics Operators Numerical Constants Part Beyond the Basics Chapter Variables Revisited Internal Variables Parameter Substitution Typing variables declare or typeset Indirect References to Variables RANDOM generate random integer The Double Parentheses Construct Chapter Loops and Branches Loops Nested Loops Loop Control Testing and Branching Chapter Internal Commands and Builtins Job Control Commands Chapter External Filters Programs and Commands Basic Commands i CAdvanced Bash ??Scripting Guide Table of Contents Complex Commands Time Date Commands Text Processing Commands File and Archiving Commands Communications Commands Terminal Control Commands Math Commands Miscellaneous Commands Chapter System and Administrative Commands Chapter Command Substitution Chapter Arithmetic Expansion Chapter I O Redirection Using exec Redirecting Code Blocks Applications Chapter Here Documents Chapter Recess Time Part Advanced Topics A Brief Introduction to Regular Expressions Globbing Complex Functions and Function Complexities Local Variables and Recursion Uno ?cial Shell Scripting Stylesheet Interactive and non ??interactive shells and scripts Tests and Comparisons Optimizations Assorted Tips Portability Issues Author's Note About the