The shell language is a high level programming language. It is more removed from system and memory processes than lower level languages. This basically means that it has commands and functions to perform tasks that would otherwise take a lot of code to execute in lower level languages like C or ass
apt-get update: Updates your version of Raspbian. apt-get upgrade: Upgrades all of the software packages you have installed. clear: Clears the terminal screen of previously run commands and text. date: Prints the current date. find / -name example.txt: Searches the whole system for the file example.