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The Software Developer's Guide to Linux

You're reading from   The Software Developer's Guide to Linux A practical, no-nonsense guide to using the Linux command line and utilities as a software developer

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Product type Paperback
Published in Jan 2024
Publisher Packt
ISBN-13 9781804616925
Length 300 pages
Edition 1st Edition
Tools
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Authors (2):
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Christian Sturm Christian Sturm
Author Profile Icon Christian Sturm
Christian Sturm
David Cohen David Cohen
Author Profile Icon David Cohen
David Cohen
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Table of Contents (20) Chapters Close

Preface 1. How the Command Line Works 2. Working with Processes FREE CHAPTER 3. Service Management with systemd 4. Using Shell History 5. Introducing Files 6. Editing Files on the Command Line 7. Users and Groups 8. Ownership and Permissions 9. Managing Installed Software 10. Configuring Software 11. Pipes and Redirection 12. Automating Tasks with Shell Scripts 13. Secure Remote Access with SSH 14. Version Control with Git 15. Containerizing Applications with Docker 16. Monitoring Application Logs 17. Load Balancing and HTTP 18. Other Books You May Enjoy
19. Index

Basics

Bash can be learned like any other programming language. It’s got an environment (Unix or Linux), a kind of standard library (any CLI-driven program installed on the system), variables, control flow (loops, testing, and iteration), interpolation, a few built-in data structures (arrays, strings, and booleans – sort of), and more.

This entire book assumes that you’re a software developer and, therefore, know how to program, so rather than teach you about these standard programming-language features, we’ll simply show you what they look like in Bash, along with some advice on idiomatic use (or common misuse).

Variables

Like any programming language, Bash has variables that can either be empty or set to a value. Unset variables are simply “empty,” and Bash will happily use them without panicking unless you set the -u (error on unset variables) option via set -u.

Setting

To set a variable, use the equals sign.

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