Advanced Bash Scripting Guide

Advanced Bash Scripting Guide is an open source project that serves as a comprehensive textbook, a manual for studying shell scripting.

Advanced Bash Scripting Guide also serves as a reference and source of knowledge on shell scripting techniques. It assumes no previous knowledge of scripting or programming.

What is new in this release:

• Two important example scripts added: an instructive and interesting morse code trainer and a Gronsfeld Cipher script.
• There is also quite a bit of new material and bugfixes.

What is new in version 6.3:

• Minor Update.

What is new in version 6.2:

• In "Special Characters" chapter,
• At "comma operator" entry, fixed first example(comment spread over two lines).
• In the "Tests" chapter,
• In the "Other Comparison Operators" section,
• Fixed up comment at "==" entry.
• Updated "ex18.sh" example.
• Multiple fixups submitted by Ramses Rodriguez Martinez.
• In the "Variables Revisited" chapter:
• In "Parameter Substitution" section:fixed typo in example at "${var##Pattern}" entry.
• In "Declare" subsection: fixed "declare | grep HOME" example.
• In "Here Documents" chapter:
• Added comment on colon being optional in "commentblock.sh" example.
• Broke out section 9.5, "Indirect References," as Chapter 27.
• Moved "The Double-Parentheses Construct" to "Operations and Related Topics" chapter.
• Moved "Operator Precedence" sectionto "Operations and Related Topics" chapter.
• Created new "Manipulating Variables" chapter out of two sections of old "Variables Revisited" chapter.
• Revised examples at two entries.
• Miscellaneous fixups of scripts and typos in text.

What is new in version 6.0:

• Fairly extensive coverage of the version 4.0 Bash release.
• A great deal of other new material and bugfixes.
• This is a very important update.

What is new in version 5.6:

• This release adds two important example scripts: Knight's Tour and Magic Squares.
• It has bugfixes and miscellaneous new material.

What is new in version 5.5:

• Many bugs were fixed.
• Additionally, there is a great deal of new material.
• Editing was done for increased consistency.
• Two new example scripts were added.