As a beginner when I learned about AS400 I was confused where to start. When confronted with a green screen that has been logged in, so my question is … Okay, what should I start with?

Just like Linux or other Unixs that use terminal based, the entire operation process is done with the command. Even though AS400 has already specified menus, using the command will make it easier for us to work on AS400. “Ah, it’s hard to memorize the commands …” That’s right, it’s not easy to memorize everything, even I don’t memorize all of the commands in AS400. But enough to understand the concept of the AS400 command then we will casually operate the AS400.