Module Title: dgt_bash03 – Story of the Bash shell
Module Description:
The module “dgt_bash03 – Story of the Bash shell” covers Bash scripting. It is intended for both beginners and experienced users who want to learn more about Bash, its origins, and how it fits within the broader context of Unix shells.
Bash is the language the machine speaks most often when it operates a Linux system, so in this academy you learn it to read it, not to type it. In the practical part you describe a task to the machine (rotate these logs, back up this directory, alert me when the disk is full) and it writes the script; you then go through it line by line, checking quoting, exit codes, error handling and portability, and send it back with precise corrections until it is right.
Key Topics Covered:
- Introduction to Shell Scripting:
- Understanding what shell scripting is and its importance in automating tasks.
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Overview of different types of shell scripts and common use cases.
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History of Bash:
- The inception of the Bourne Again Shell Bash and its development by Brian Fox for the GNU Project.
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Key milestones in the evolution of Bash and its impact on Unix-like operating systems.
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Understanding Bash Scripting:
- Basic syntax and structure of Bash scripts.
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Control structures, functions, and best practices in scripting.
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Bash vs. Other Shells:
- Comparative analysis between Bash and other popular shells like Bourne Shell sh, KornShell ksh, and C Shell csh.
- Discussing the unique features and use cases of each shell.
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Compatibility considerations when migrating scripts across different shells.
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Practical Applications:
- Real-world examples demonstrating how Bash scripting can simplify complex tasks.
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Natural-language exercises: describe a task to the machine, review the script it writes and guide it to an efficient, effective solution.
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Advanced Topics:
- Exploring advanced features in Bash such as arrays, regular expressions, and signal trapping.
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Introduction to debugging techniques for shell scripts, so you can trace a fault in the machine’s script and explain the fix.
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Shell Script Security:
- Best practices for secure Bash scripts, and how to require them from the machine.
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Common pitfalls and how to spot them in generated code.
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Future of Shell Scripting:
- Trends and future directions in shell scripting and automation, including scripts generated from natural-language instructions.
Module Outcomes:
By the end of this module, participants will have a solid foundation in Bash scripting and an understanding of its historical context and relationship with other Unix shells. You’ll be able to obtain robust scripts from the machine, judge their interoperability across different environments, and describe the role of Bash within the broader shell ecosystem.
The module applies both to the automation of routine tasks and to the development of complex systems, using Bash scripting through natural language.
Prerequisites:
Basic familiarity with command-line interfaces is recommended but not required. Participants with no prior experience in shell scripting can start from the introductory lessons at the beginning of the module.
The module covers the history, capabilities, and future of Bash scripting.
The students can push their exercises to the Academy DevOps & SRE Git project. For this module, create a folder with your username as its name in the following subfolder: https://github.com/Garanti-Del-Talento/gdt_academy