Drush 9 is finally here with some much-awaited changes. Drush 9 commands are now classes and .inc files are obsolete. Drush commands will now be based on the Annotated Command format. This will change the fundamental structure of custom Drush commands.

Step 1 : Install pptp client.

sudo apt-get -y install pptp-linux

Step 2 : Setup PPTP Client

Add secret:

File : /etc/ppp/chap-secrets
You can use:
sudo nano /etc/ppp/chap-secrets

rsync is a powerfull tool to synchronize the files and directories. Can be use for local or remote using ssh.

Source Tutorial : https://www.thegeekstuff.com/2010/09/rsync-command-examples/

Syntax
rsync options source destination

Mount a linux partition encrypted with LUKS using terminal

Install Crypsetup:

sudo apt-get install cryptsetup

To decrypt the volume:

sudo cryptsetup luksOpen /dev/sda1 my_encrypted_volume

Example 1 : Without changing user session.

$query = \Drupal::entityQuery('node');
$query->condition(DOMAIN_ACCESS_FIELD, 'domain_id'); // Set the domain id hear
$query->condition('type', 'article');
$query->condition('status', 1);