This function in Drupal 8 allows you to test the user's current role and give them access to some sort of data programmatically. For example, you might have a custom block that you want only a certain role to see. This function below will give you that functionality. Add the code to your .module file in your module .theme in your custom theme.

Beetbox is an amazing for developing all sorts of websites. But installing it on an Ubuntu host at times there can be some small issues.

Extra vagrant packages

Make sure you provision the vagrant machine after adding the plugins as you can get the dreaded "No host IP was given to the Vagrant core NFS helper" (see issue here)

vagrant plugin install vagrant-vbguest
vagrant plugin install vagrant-faster
vagrant plugin install vagrant-hostsupdater
vagrant plugin install vagrant-auto_network

Here is a list of commands the help managed your Linux machine from day to day

Find and kill a linux process from the command line

Need to remove a software process that will not go away. You might need to do it more that once,

ps aux | grep <programs name(eg firefox)> | awk 'NR==1 {print $2}'
kill -9 <number that was printed>
(eg,firefox)>

Setup your public ssh key so you can auto login into a server

So pipes your local public ~/.ssh/id_rsa.pub and It copies the public key to the remote server 

The Linux terminator is a multi-paneled terminal tool that as some get tricks to speed up your everyday processes while working. As a Web Developer and DevOps administrator, this tool helps from clearing a websites cache to setting up of a server and even using vim as an IDE.  Here are some commands and tips that will help you get best out of the terminator.

1. Grouping (or synchronizing) the terminal commands

When you have multiple terminals open and you need to them to have all the same command the following  keybinding will do this.

Super+G – Group All
Super+Shift+G – Ungroup All
Super+T – Group Tab
Super+Shift+T – Ungroup Tab

This bash function can find a file in a child directory and change directory to the file it is once found.

function cdf() {

    THEFILE=$1
    
    FILECOUNT=$(find  .  -name $THEFILE | wc -l)

   if ; then
       CHANGEPATH=$(find . -name $THEFILE  -printf '%h\n');
        echo "Warning file was found $CHANGEPATH";
        cd  $CHANGEPATH;  
  
   else    
          echo "Warning: $THEFILE was not found"
   fi
    
}
alias cdf=cdf

At times in Drupal 8, a site builder needs to create a custom content type page twig file. In Drupal 8 you can't just create it like you do with other twig files that come with Drupal core , you have to register a suggestion with the theme array. Adding The functions below to your template.theme will give the developer the ability to add a twig file called page--<content_type_name>.html.twig. Overriding the default page twig file in your theme

At times you need to know the machine name of the current node. The function below will allow you to access the machine name anywhere on a page load.

/**
 * @return array|null
 */
function _access_current_node_machine_name()
{
    $nidResult = \Drupal::service('path.current')->getPath();
    $nid = explode('/', $nidResult);
    if ($nid[2] != NULL) {
        $node = \Drupal\node\Entity\Node::load($nid[2]);
        return array(
            'node_id' => $nid[2],
            'node_content_type' => $node->getType(),
        );
    }
    return NULL;
}

In Drupal 8 adding a variable so the twig layer can access it on every part of  the page can be done by using the template preprocessor, The word template in this function will be replaced by your theme name.

/**
 * Implements hook_preprocess().
 */
function template_preprocess(&$vars) {

  $vars['global_var_name'] = 'This is my var';

}

And then in the twig layer(file) where you need to use the variable.

{{global_var_name}}