Simple Commands

• date - we want the computer to tell us today's date.
• whoami - displays the login name of the current user, who (for the purpose of these lessons) is "ozdogan". The computer should respond with your login name.
• echo - it tells the computer to retype the string after echo. Try the followings;
  echo This is a test
  echo $SHELL
  Why the output is different now? What is $SHELL?