> For the complete documentation index, see [llms.txt](https://www.theprogrammershandbook.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.theprogrammershandbook.com/nix.md).

# \*nix Systems

- [Introduction](https://www.theprogrammershandbook.com/nix/intro.md)
- [Commands](https://www.theprogrammershandbook.com/nix/commands.md): A collection of useful Linux commands and how to use them.
- [Directories](https://www.theprogrammershandbook.com/nix/directories.md): How is the Linux file system laid out and what do all those weird three letter words (etc, var, bin...) mean?