Open 3 files in vertically split editor windows at the same time

Open the default editor.
More information: <https://manned.org/sensible-editor>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

sensible-editor -O3 {{file_1}} {{file_2}} {{file_3}}

click the source code to copy install sensible-editor on any operating system with command-not-found.com