$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Install Sublime Text 4 on Gnu/Linux Distros

GNU/Linux Installing Sublime Text 4 Guide

The Linked Guides Show you Step-by-step How to Install Sublime Text Editor 4.X on some most diffused GNU/Linux Desktops.

And Sublime Text 4 for Linux is a Cross-Platform Text and Source Code Editor, with a Python API and its functionality is nicely extendable with Plugins.

Finally, Sublime Text is a Non-free Software, But it Give you an Unlimited Evaluation Time Period.

Install Sublime Text 4 Editor on Linux - Featured

GNU/Linux Sublime Text 4 Editor Installation Guide