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

Step-by-step – Nagios 4 Installation in Kali

February 9, 2020 | By the+gnu+linux+evangelist.

Getting

  1. 4. Downloading

    Download Latest Nagios Core Linux Source

    Nagios Core tar.gz Archive
  2. 5. Extracting

    Then Extract Nagios Core into /tmp
    Possibly Double-Click/Right-Click and Open with Archive Manager:

    How to Install Nagios Core on Kali GNU/Linux 2020 Easy Guide - Extracting Nagios

    Or from Command Line:

    tar zxvf ~/Downloads/nagios*.tar.gz -C /tmp/