Linux Shell Scripting with Bash View Larger Image | Ken O Burtch
Sams, Paperback, Published January 2004, 412 pages, ISBN 0672326426 | List Price: $39.99
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With the proliferation of Linux as both a server and desktop operating system,
users are looking for more advanced methods of getting up and running quickly
and efficiently solving problems. The most powerful way of achieving this is
to employ the command line interface known as the shell. Bash, the Bourne Again
Shell, is the most popular Linux shell today.
Linux Shell Scripting with Bash emphasizes professional scripting solutions
through the use of structured programming and standard Linux development tools.
The book focuses on the Linux environment and the robust tool set therein. Because
the shell relies on the operating system for its functionality this is the ideal
methodology to learn shell scripting and sets the book apart from general scripting
titles. Promoting good programming practices with real-world scripts, which
are readable, extendable, and easy to debug, this book will be an essential
asset to any Linux user.
Table of Contents
1. The Linux Environment.
The Origin of Linux. Files and
File Systems. Directories. Inodes and Links. Pipe and Socket Files. Device Files.
2. Operating the Shell.
Bash Keywords. Command Basics.
Command-Line Editing. Variable Assignments and Displaying Messages. Multiple
Commands. Command History. Directory Commands. Specialized Navigation and History.
The Colon Command. Reference Section.
3. Files, Users, and Shell Customization.
Listing Files. printf Command.
Getting Help. Fixing the Display. Working with Files. Working with People. Shell
Aliases. The Bash Hash Table. Customizing Your Prompt. Long Command Lines. Customizing
Command-Line Editing. Your Session Profile. Reference Section.
4. Script Basics.
Creating a Script. Creating a
Well-Behaved Script. The Header. Global Declarations. Sanity Checks. The Main
Script. Cleanup. Stopping a Script. Reading Keyboard Input. Basic Redirection.
Standard Output, Error, and Input. Built-In Versus Linux Commands. The Set and
Shopt Commands. Reference Section.
5. Variables.
Variable Basics. Predefined Variables.
The Effect of Quotations. Variable Attributes. Arrays. Exporting Variables and
the Linux Environment. The eval Command. story.bash: A Story Generator. Reference
Section.
6. Expressions.
Expansions. The Basic if Command.
File Expressions. Multiple Tests. Strings. Arithmetic Expressions. Logical Expressions.
Relational Operations. Bitwise Operations. Self-Referential Operations. Other
let Features. temperature.bash: Converting Fahrenheit to Celsius. Arithmetic
Tests. Pattern Recognition. Globbing Options. Filename Brace Expansion ( {..}
). Dollar Sign Substitutions. Arithmetic Expression Substitution ( ((..)) ).
mixer.bash: HTML Color Mixer. Reference Section.
7. Compound Commands.
Command Status Codes. if Command.
case Command. while Loop. until Loop. for Loops. Embedded let ( ((..)) ). Grouping
Commands ( {..} ). report.bash: Report Formatter.
8. Debugging and Version Control.
Shell Debugging Features. Debug
Traps. Version Control (CVS). Creating Transcripts. Watching Running Scripts.
Timing Execution with Time. Creating Man Pages. Source Code Patches. Shell Archives.
Reference Section.
9. Parameters and Subshells.
Positional Parameters. The getopts
Command. The getopt Command. Subshells. Reference Section.
10. Job Control and Signals.
Job Control. Signals. The suspend
Command. Traps. Exit Handlers. The killall Command. Being Nice. Process Status.
Reference Section.
11. Text File Basics.
Working with Pathnames. File
Truncation. Identifying Files. Creating and Deleting Files. Moving and Copying
Files. More Information about Files. Transferring Files between Accounts (wget).
Transferring Files with FTP. Transferring Files with Secure FTP (sftp). Verifying
Files. Splitting Large Files. Tabs and Spaces. Temporary Files. Lock Files.
Named Pipes. Process Substitution. Opening Files. Using head and tail. File
Statistics. Cutting. Pasting. Columns. Folding. Joining. Merging. Reference
Section.
12. Text File Processing.
Finding Lines. Locating Files.
Finding Files. Sorting. Character Editing (tr). File Editing (sed). Compressing
Files. Reference Section.
13. Console Scripting.
The Linux Console. The Console
Keyboard. The Console Display. tput. select Menus. Custom Menus. Reference Section.
14. Functions and Script Execution.
Running Scripts. The Linux Execution
Environment. The Source Command (.). Switching Scripts with exec. Writing Recurring
Scripts. Writing Continually Executing Scripts. Shell Functions. Local Variables.
Recursion and Nested Functions. Function Attributes. Reference Section.
15. Shell Security.
The Basic Linux Security Model.
Knowing Who You Are (id). Transferring Ownership (chown/chgrp). Changing Access
Rights (chmod). Default Access Rights (umask). setuid/setgid and Scripts. The
chroot Command. Resource Limits (ulimit). Restricted Shells. Secure File Deletion
(wipe). Reference Section.
16. Network Programming.
Sockets. Client-Server and Peer-to-Peer.
Network Clients. CGI Scripting. CGI Environment Variables. Processing Forms.
Basic Web Page Stripping (lynx). Reference Section.
17. Data Structures and Databases.
Associative Arrays Using Bash
Arrays. Hash Tables Using Bash Arrays. Binary Trees Using Bash Arrays. Working
with PostgreSQL Databases (psql). Working with MySQL Databases. Reference Section.
18. Final Topics.
The echo Command. More Uses for
set. Date Conversions. Completions. Locales. The du Command. Memory Usage. noclobber
and Forced Overwriting. The fc Command. ! Word Designators and Modifiers. Running
Scripts from C. Journey's End. Reference Section.
Appendix A. A Complete Example.
Appendix B. Summary of Bash Built-In Commands.
Appendix C. Bash Options.
Appendix D. Error Codes.
Appendix E. Signals.
Appendix F. ASCII Table.
Glossary.
Index.
About the Author
Ken O. Burch graduated Computer Science first class
honors degree from Brock University in St. Catharines, Canada and did his Masters
work at Queen's University in Kingston, Canada. He has been actively using Linux
since kernel 0.97. He is a member of the Association of Computing Machinery
(the world's largest professional computer organization) and a member of Durham
Region Writers' Circle (one of the largest writing organizations in Canada).
Ken heads up PegaSoft Canada, one of the Canada's oldest Linux companies.
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