 We've got our Ubuntu Linux server running in VirtualBox, and so far we've been using the VirtualBox user interface to log in and issue commands. I'm going to show you how to use another client software to log into our server, and we're going to use PuTTY. We're going to use PuTTY as a secure shell client, and there's other secure shell clients. For that to work, we need a secure shell server running on our demo Linux server. First, we'll install that. The full command to install, I know the name of the server. I want to install the package called OpenSSHTF server, a common secure shell server on my Linux machine. We use the Ubuntu package manager app to install that, and we need administrator privileges to do that. So we proceed this command with sudo and we are prompted for our password, we type it in, and then it goes away and checks which software packages are needed, and asks me do I want to continue. Yes, I do. Now it downloads those software packages and installs them. This is setting up a server on my Linux machine that allows clients to securely log in to my Linux machine. So it's up and running, and now I'm going to use PuTTY to act as the client, and it assumes you've got it installed. It's a free download, brings up a window which asks me what's the host name or IP address that I want to connect to. I can get that. One way is using I have config on my server, what's the host name or IP address of my server. We see it's what the INED address is 138.77176.57. So we'll type that in. The port number of 22 is the default value, which is used for the secure shell protocol and we keep that. The other settings should work as default, so we'll try and log in. It's just bringing up windows here or bring them across. First, it gives me this security warning saying, the client saying, I don't really know if I can trust this server, something about the keys fingerprint. What we really should do is check that this INED is the fingerprint of the server. In case someone is performing some man in the middle attack. Well, I'm pretty sure they're not because the client is on my computer. The server is on my computer, but just inside virtual box. So I trust it. So I'm going to say, yes, I trust it. Now I'm going to trust it in the future. That brings up our putty login interface. You can see very similar to the virtual box interface, a black terminal asks us to log in and enter the password. And now I'm logged into the same Linux machine but using the putty secure shell client. And I can run commands just as I could via the virtual box interface. So not much difference at this stage, except now we can do it from other locations if needed. We can do that across a network, not just locally on our computer. And even if we don't do that, we'll find the putty is much more configurable in terms of the user interface. We can change settings to make it look nicer. So I'll show you how to do that with a few examples. If we right click on the top menu bar, then we see some settings specific to putty. I'm going to change some of them. And it brings up a window where we can specify some settings. So for example, we can change the appearance. I can change the font size. And the font style, console us, let's make it 16, so it's a bit bigger. When we select for copy and paste, there are different modes in which we can do selection. And a common mode in Linux and in terminals is that, and referred as the X term mode here, is that I select with my left button and use middle button to paste. I'll show that in a moment. So I'm just going to change because by default putty doesn't use this X term or Linux approach. It uses a compromise between windows and Linux. I prefer this one because it's natural to Linux. You can change other things like color schemes, although it's not so easy. You need to change individual characteristics. You can save settings to the default settings and change what's logged and a few other options that we may use. Let's try that. And quite simply, it's made my font slightly bigger, so it's a bit easier to see. So that's much more powerful than what VirtuaBox offers, which is simply fixed size font and fixed colors. Regarding copy and paste, if I type echo and I select that with my left mouse, to paste, I simply middle click now. So you don't need to use the keyboard to copy and paste. You don't need to right click and bring up a menu, just select automatically copies, middle click, pastes. And you can change settings and save sessions so that you can have different settings depending upon the system you log into. So explore the putty settings and create the configuration that is best suited to your needs.