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

How to Install Rar on RHEL-based Distros

RHEL-based Installing Rar – Step by step Guide

How to Install Rar on CentOS GNU/Linux Command Line.

RAR is a Proprietary Archive File Format that supports Data Compression, Error Recovery and File Spanning.

It was developed in 1993 by Russian Software Engineer Eugene Roshal and currently is licensed by win.rar.

How to Install Rar on CentOS GNU/Linux Distro

GNU/Linux RHEL-based RAR Installation Guide