How to run php artisan queue:listen in background on Ubuntu or Linux machine

1. Login to ubuntu machine using putty or any other ssh client
2. Run command: sudo -s
3. Run command: cd /opt/lamp/htdocs/<Laravel project directory name>
4. Run command: sudo vi
5. Click “i” for insert mode
6. Type: php artisan queue:listen
7. Press ESC button to exit from insert mode
8. Press :wq
9. Now run command: nohup /dev/null &

Now even if you logout from the ubuntu putty session the queue remains running