> For the complete documentation index, see [llms.txt](https://olb.gitbook.io/linux-essentials-certification/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://olb.gitbook.io/linux-essentials-certification/5.security-and-file-permissions.md).

# 5.Security and File permissions

- [5.1 Basic security and users type](https://olb.gitbook.io/linux-essentials-certification/5.security-and-file-permissions/5.1-basic-security-and-users.md)
- [5.2 Creating users and groups](https://olb.gitbook.io/linux-essentials-certification/5.security-and-file-permissions/5.2-creating-users-and-groups.md)
- [5.3 File permissions and ownership](https://olb.gitbook.io/linux-essentials-certification/5.security-and-file-permissions/5.3-file-permissions-and-ownership.md)
- [5.4 Special directories and files](https://olb.gitbook.io/linux-essentials-certification/5.security-and-file-permissions/5.4-special-directories-and-files.md)