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Let's continue adding in a little bit more configuration to our command.

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Remember, we want to allow multiple different variations of this JDBC serve command to be executed.

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So we should be able to allow a user to run just JDBC served by itself.

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If they do so, we're going to make an assumption about the name of the file that we're going to store

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all the user cells in.

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We're also going to use some kind of default value for the port to run our server on as well.

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But then we're going to also allow a ton of different variations of this command so user can run JDBC

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serve and then provide a file name, daybook serve and then provide a specific port to run our server

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on daybook, serve filename and port daybook, serve Dashty or JDBC serve booked up and then the port.

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So what different variations here.

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So we're going to write in a couple of different options to our command to tell Commander about all

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these different possible variations.

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The back inside of our editor.

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We're going to first find command right here and inside of serve for that string.

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Right after it, we will put in brackets file name like so.

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So this is going to tell commander that there's going to be some optional value that a user is going

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to provide here.

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So it may or may not be present at some point in time.

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We're going to have to also provide the default value.

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We'll take care of that in just a moment.

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Let's also add in an option to tell commander that we want or might receive a port option, so dash

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dash port or just dash P.

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For that, right after our description, we will add in option then instead of a string Kaspi bomber

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dash dash port.

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Angle, brackets, number.

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Well, then put in a second argument as a string that is going to describe what this option is all about.

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Let's say port to run, server on.

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And then finally, we will provide a default value for it.

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As a third argument to option, I'm going to put in four thousand five.

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So that's going to be our default ports, water on.

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You'll notice I'm adding that in as a string.

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That is because whenever a user gives us command line arguments, they're always, by default treated

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as a string, even if it looks like it actually is a number.

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So we're going to make sure that whatever default value we are given or whatever value a user provides

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to us, we're always going to treat it as a string or we're going to eventually pass it into a number.

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Now, you might notice that in some places I'm using some square brackets and in others I'm using angle

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brackets, square brackets are indicating to commander that this is an optional value and it may or

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may not be present in brackets, indicate that this is a required value.

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So if a user is going to provide the support option, they must provide a number to us as well.

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All right, let's save this.

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I'm going to flip back over and we'll do another quick test at our terminal.

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Now back inside of our district.

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We should have an updated index just filed right there.

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So I should be able to run Noad Index serve.

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And still see everything work as expected.

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I should also be able to do a dash dash help and get some updated information about the different options

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we can provide.

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So now we have these different options around providing support.

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And we're also told that option that we can provide a file name as well.

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So how do we actually receive these different options and do something with them?

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Well, for that, we're going to receive them as arguments into this action function right here.

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So the first argument to this action function is going to be whatever optional arguments or required

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arguments are passed to the original route command right here.

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So in other words, the first argument is going to be our file name.

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I'm going to provide a default value for this, so this is where we can set up a default value.

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You're going to say that the user does not give us a default value.

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We're going to assume that we want to save a listing of all their cells into a notebook file.

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Then our second argument is going to be a object with all the different options inside of it.

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We will put in.

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Or how about just right now, we'll just receive, let's call it options.

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We'll take a look at what that object actually looks like and then eventually just d structure out the

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properties we actually care about.

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So then rather than doing a simple console log right here, I'm going to try to console log out filename

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and options.

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Let's then save this back to the terminal and another quick test.

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Now, I should able to do a node in index, just serve with.

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Nothing, and we'll see that my default of notebook's was provided and I got a report of four thousand

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five.

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I should be able to do a serve with books.

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And now my first argument is books, I should go to do a dash dash port of, say, 5000 and have that

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now be my port.

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I built to do a dash p.

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Yep, that's my port, and then finally, I should be able to also list options before.

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The book option as well, or really the argument if I put in Noad index dogs serve dash five thousand

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and then that filename, it should still work as expected.

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Yep, still does.

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Remember, there's going to account for users possibly thinking that they can put in options before

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the actual file name.

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The commander is incorrectly interpreting all these different variations and parsing everything accordingly.

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Finally, just one last very small variation I should be able to do.

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A dash dash port equals five thousand.

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Yep, that still works as well.

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OK, so that's pretty much it.

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You can tell that commander is really doing a lot of work here.

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It is handling just about every corner case we can possibly think of and essentially parsing all the

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different command line arguments and providing them to us as arguments.

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To our action function right here, so let's take a quick pause right here, come back the next video.

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We're going to finish up our SERP command and then move on to putting together our local API.