 This is a quick tip for Linux systems. Maybe true for other Unix type systems. I would think maybe so. And if you are familiar with computers at all with a networking, you know that different services run on different ports by default. I mean, obviously you can make HTTP server run on any ports you want or really any other service. But they have default ports like HTTP should be run on 80 or 8080 if it's encrypted HTTPS. And like a SSH shell should be running on port 22 by default unless you've changed that. And there you can go online and Google list of port numbers and see what they're for. But actually most Linux systems have a list array for you. It's just a plain text file. And we'll cat it out over here. We'll say cat. We'll say folder is ETC and the file is called services. If we cat that out, you can see a list of ports and what services they are off to the right. So this is a quick, easy way to get a list of that without having to go online because it's probably on most systems. So of course you can also use less to go through that and scroll through it if you'd like. Cue to get out of that. And then you can also search for stuff using grep. So like, oh, what port is SSH supposed to run on by default? We can say grep SSH from that file. And you'll see that SSH is running on port 22. It's an SSH remote login protocol. Of course you can also go the other way with the port number. You might get a little bit more than you are looking for. But we'll search 22. So of course you're going to get other ports here that have the number 22 in them. But you can quickly see 022. Oh, right there, SSH. So this was a quick tip. And since it's kind of a quick short little video, I'm going to give you a little extra tidbit of information. I've got my Arcos tablet running Android connected to my computer. So I'm going to run a ADB shell to log into that. I'm connected to it through USB. And by default I'm inside a busy box shell here. And just to show you, even though Android is a pretty slim down system, it also has this same service file here. So even if you're on an Android phone, if you have your shell or a way of looking at files, you can access this file by default, at least on my tablet here with a very basic version of busybox. There is no less command, but more or less less. Yes. So services I can spell stuff right. There we go. And there we go. I can now go through here. Formatting is a little bit off on the Android doing it this way, but you can quickly find through there. And of course, you should be able to grep for port 22 on that file and get the same output. Obviously grep on Android. It doesn't have the color coding built in, but not a big deal in this case. But there you go. So that's the file, ETC services. And it seems to be on even slim down systems of Linux. I mean, I'm sure maybe there's other versions of Linux out there that don't have it. But if it's on Android, it's probably on most distributions out there for desktops. And it's just a quick easy way without having to get online and Googling it to maybe search for different protocols and ports. So you can see what these services do or where these services run. And that's it for the story. That was kind of a quick short one. Hope you enjoyed it. Hope you find it useful. And it's just a little bit on your Linux system. Thank you for watching. Please visit filmsbychrist.com. That's Chris with the K. There should be a link in the description. And I hope that you have a great day.