Simple Commands

• date - displays the current date and time.
• whoami - displays the login name of the current user.
• echo - tells the computer to retype the string afer echo. Try the following:
  
  echo This is a test
  
  echo $USER
  Why the output is different now? What is $USER?
  
  echo 2 + 2 = $((2+2))
  What is the output of $((2+2))?