Installing
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2. Installing NodeJSHow to Install NodeJS on GNU/Linux 
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3. Installing GruntThen to Install Grunt Command Line Interface 
 Play:npm install -g grunt-cli Or: sudo npm install -g grunt-cli 
Contents
$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }
How to Install NodeJS on GNU/Linux
Then to Install Grunt Command Line Interface
Play:
npm install -g grunt-cli
Or:
sudo npm install -g grunt-cli