The Lash Book

This guide teaches Lash as a programming language for Bash automation.

Lash keeps shell scripts close to Bash, but adds a parser, semantic checks, structured blocks, arrays and maps, compile-time directives, and a small amount of safer syntax around common shell patterns.

Use this book for learning and examples. Use the language spec when you need the exact implemented surface.

How to read this

1. Read chapters 1-6 first. They cover the Lash syntax you will write most often.
2. Use chapters 7-9 when you need shell interop, jobs, traps, or compile-time directives.
3. Keep chapter 11 nearby when porting Bash; it calls out the behavior that is easy to misread.

Navigation

See SUMMARY.md.