System Code Geeks Operating System Developers Resource Center

In this tutorial, we will cover SSH port forwarding in Linux. This is a function of the SSH utility that Linux administrators use to create encrypted and secure relays across different systems. SSH port forwarding, also called SSH tunneling, is used to create a secure connection between two or more systems. Applications can then use these tunnels to transmit data. ...

In this tutorial, you will learn how to use the very essential grep command in Linux. We’re going to go over why this command is important to master, and how you can utilize it in your everyday tasks at the command line. Let’s dive right in with some explanations and examples. Why do we use grep? Grep is a command ...

In this tutorial, we will cover the cURL command in Linux. Follow along as we guide you through the functions of this powerful utility with examples to help you understand everything it’s capable of. The cURL command is used to download or upload data to a server, using one of its 20+ supported protocols. This data could be a file, ...

You can think of Linux runlevels as different “modes” that the operating system runs in. Each of these modes, or runlevels, has its own list of processes and services that are either turned on or off. From the time Linux boots up, it’s always in some runlevel. This runlevel may change as you continue to use your computer, depending on ...

In this tutorial, we will talk about killing a process in Linux with multiple examples. In most cases, it’s as simple as typing “kill” command followed by the process ID (commonly abbreviated as PID). In the screenshot above, we’ve killed a process with the ID of 1813. If you are a Windows user, it may help to think of the ...

It’s been awhile since I’ve talked about running OpenShift Container Platform on your local machine. This mean a container platform at your finger tips, one you can experience the joys of cloud native development and automated rolling deployments. Since I started pulling together ways to easily experience this with OpenShift Container Platform, back with version 3.3 believe it or not, ...

macOS Finder offers a possibility to preview the files of any type without opening them with Quick Look. By default Quick Look supports most commonly used file formats which may not be enough if you are a developer and you want to preview source code files i.e. Java or Python or any other un-common file types. Quick Look plugins Quick ...

This is more of a reminder for myself so I don’t need to keep googling or looking at man when I need to look up the syntax. Let’s assume you have two hard drives, ones called PHOTOS the other other PHOTOS_BACKUP. You can use the following command to sychronise photos (including removing all files that were deleted on PHOTOS to ...

In this post, you will learn about listing users in Linux. Besides this, you will know other tricks about Linux users’ characteristics. There are 2 types of users in Linux, system users who are created by default with the system. On the other hand, there are regular users who are created by system administrators and can log in to the ...