2 Answers
clear is a native command for the Linux platform which Cloud Shell runs. There is no package that is needed. As commands are case sensitive, make sure you are typing it all lower case.
It’s been always like that. If you want some great implemented features about monitoring all the logs of your customers or potential customers, or maybe your workers, you should pay attention to these guys because the are professionals of the software infrastructure world. They know for sure what they develop for their customers.
This is like when you make something up in the interview that is completely off topic hoping to confuse the interviewer.