1. Run the following command
    sudo nano /private/etc/motd

  2. Paste your desired message or figlet design via tools like the link

  3. Save with Ktrl + o. Hit y to save.

  4. Restart Terminal app.

More ASCII Art

Check the following link to access more options.



         █████   █████ ██████████ █████       █████      
        ░░███   ░░███ ░░███░░░░░█░░███       ░░███       
  █████  ░███    ░███  ░███  █ ░  ░███        ░███       
 ███░░   ░███████████  ░██████    ░███        ░███       
░░█████  ░███░░░░░███  ░███░░█    ░███        ░███       
 ░░░░███ ░███    ░███  ░███ ░   █ ░███      █ ░███      █
 ██████  █████   █████ ██████████ ███████████ ███████████
░░░░░░  ░░░░░   ░░░░░ ░░░░░░░░░░ ░░░░░░░░░░░ ░░░░░░░░░░░ 





,-. ()               ,-.       ,-.  ,-.       ,-.
| | ()          ||  <,- \_____/  ` <,- \_____/  `
| ' () ....     ||    /  ___. \      /  ___. \   
|   /\ `=.`''===.' ,_(__/ ,_(__\  ,_(__/ ,_(__\  





         `Yb.           .dP'                        
           `Yb        dP'                           
             Yb                                     
.d888b.       Yb       'Yb   `Y8888888b. `Y8888888b.
8'   `Yb     dPYb       88      .dP'        .dP'    
Yb.   88   ,dP  Yb      88    ,dP         ,dP       
    .dP  .dP'    `Yb.  .8P    88     .    88     .  
  .dP'                        `Yb...dP    `Yb...dP  
.dP'                            `"""'       `"""'