How you can create your own commands!!!

Hi everybody.... I don't know if this has happened to you already, sometimes you have the need to call a particular command, using the command line more than once or something happens and you start looking up in your notes how is this command called?... Where do I put it? Well, this video could help you resolve that problem and also give you an idea of how you could customize your User Interface... Enjoy the video! ... How you can create your own commands