Completely blown away at how to write scripts in linux : So i started today taking a look at scripting using vim and im just so very lost and was looking for some help in a few areas. First is when something says that it wants me to process a file as a command line argument and if a file isnt included when the user executes this script then a usage message is displayed followed by exiting the program. I have no clue where to even start with that, will i need and if then statement or what?