Advanced

You maintain batch scripts in production — build steps, installers, scheduled jobs. This level is about doing that well: recursion, the registry, interop with wmic and PowerShell, real text processing, performance, hybrid scripts, packaging, and debugging the cryptic failures.

Lessons

#	Lesson	You'll learn
1	Recursion & advanced for	recursive subroutines, for /R, walking trees, guarding depth
2	Robust argument parsing	--flags, /opt:value, optional/positional args, quoting
3	Working with the registry	reg query/add/delete, parsing reg output with for /F
4	WMIC, where & calling PowerShell	wmic (and its deprecation), where, one-line PowerShell escapes
5	Text processing with findstr	findstr regex, filtering, counting, its many quirks
6	Performance & pitfalls	pipe subshells, for overhead, when batch is the wrong tool
7	Hybrid scripts	batch + PowerShell and batch + JScript in one file
8	Packaging & distribution	self-contained scripts, %~f0, config files, signing note
9	Debugging techniques	echo tracing, cmd /k, reading the real error
10	Capstone: deployment automation	a production-grade multi-step deploy script

When you're done

You know batch as well as it is worth knowing. The most valuable advanced skill is judgment: Lesson 6 is about when to stop writing batch and reach for PowerShell or a real language.