> For the complete documentation index, see [llms.txt](https://en.itmatic101.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://en.itmatic101.com/linux.md).

# Linux

- [SSH certificate authentication](https://en.itmatic101.com/linux/ssh-certificate-authentication.md)
- [SSH key authentication for LDAP login](https://en.itmatic101.com/linux/ssh-key-authentication-for-ldap-login.md)
- [Using GPG to encrypt/decrypt files or messages](https://en.itmatic101.com/linux/gpg.md): This post is showing how to use GPG key encryption on Linux environment.
- [Understanding SUID, SGID and Sticky Bit](https://en.itmatic101.com/linux/understanding-suid-sgid-and-sticky-bit.md)
- [Unleashing VIM](https://en.itmatic101.com/linux/unleashing-vim.md): This page is the how-to note on VIM as new tricks learned.