Administered by:
Microsoft's open-source command-line text editor works really well on Ubuntu - and a snap makes it easy to install!
https://www.omgubuntu.co.uk/2025/06/microsoft-edit-text-editor-ubuntu
@omgubuntu That looks like a screen editor, not a line editor. Is CLI the right way to describe it?
@jtb I'll be honest: I don't really know the difference! To me, a tool that can only be used from the command-line is a command-line tool, as Edit is, and as it's a text editor, I'd describe it as a "command-line text editor" — but I appreciate I may be alone in that! Edit's TUI does works with a mouse, but it's also perfectly happy with a keyboard only. 
@omgubuntu There is a line editor called Ed, available on Debian. They used to be able to work on printer terminals! :)
https://medium.com/predict/using-ed-the-unix-line-editor-557ed6466660