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

How to Install GRUB Customizer on RHEL-based Distros

GNU/Linux RHEL-based Installing GRUB Customizer Guide

How to Install GRUB Customizer on RHEL-based GNU/Linux desktops – Step by step Tutorials.

And Grub Customizer for CentOS is a GRUB GUI Tool.

Especially relevant: also if you can directly edit the GRUB Configuration Files on the Command Line this Tool is very useful and valuable to easily manage and dive into the tricky Grub2 Configuration.

Finally, this Guide is valid also for all the others RHEL Based Distros like:

Red Hat Enterprise Linux
Oracle Enterprise Linux
Rocky Linux
AlmaLinux

How to Install GRUB Customizer on CentOS GNU/Linux Distro

GNU/Linux RHEL-based GRUB Customizer GUI Installation Guide

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