My top used shell command is |. This is called a pipe. In brief, the | allows for the output of one program (on the left) to become the input of another program (on the right). It is a way of connecting two commands together. For example, if I were to run the following: echo "hello" I get the output hello. But if I run: echo "hello" | figlet The figlet program, changes the letters in hello to look all bubbly and cartoony. This is a really blunt way of describing something that, in my opinion,...