This version is used to look at the contents of a shell varaible. In this case, the contents of the PATH variable are displayed.
echo 'Show me the money' > cash.out
This version shows how a echo can be used to create files. The output of echo is sent to the file called cash.out. The greater than sign, > is used with a technique called redirection.
echo can be used to set terminal settings. If you use the hat character, shift 6 key on US English keyboards, this sequence will not reset a foobared terminal. The hat character repersents the escape character, ASCII 27. The control key and [ key are used to create the escape character.