Modern Shell Scripting for Linux

The shell is the connective tissue of modern software. This book teaches you to master it.Every CI pipeline runs shell. Every Docker image is built with shell. Every serverless deploy, every cloud CLI, every Kubernetes script — all of it runs through the shell. It is the universal interface of computing, and it is not going away.Modern Shell Scripting for Linux is a hands-on guide to writing shell scripts that work everywhere — from a quick Bash one-liner to a cross-platform PowerShell automation running in CI. It covers all three modern shells with a single, unified mental model.Inside you will learn how to:Write Bash scripts that are correct, readable, and safeUnderstand the differences between Bash, Zsh, and POSIX shellHandle errors, signals, and edge cases properlyDebug with shellcheck and shfmt, and test with batsManage processes, jobs, and parallelismProcess text with grep, sed, awk, and regular expressionsWrite cross-platform PowerShell for modern automationBridge Bash and PowerShell for CI/CD pipelinesBuild deployment, sysadmin, and DevOps scripts that scaleApply security best practices — from command injection defense to secret handlingNo theory for theory's sake. No clever tricks. Just the patterns, disciplines, and habits that make shell scripts last.Write scripts that run reliably today, tomorrow, and five years from now.