This page explains use cases and examples of SSH tunnels while visually presenting the traffic flows.
(Note that you need to scroll down a little to see the actual SSH command examples).
Source: Visual guide to SSH tunnels
OpenSSH Tip: Check Syntax Errors before Restarting SSHD Server
This page explains how to check the OpenSSH sshd server configuration file for syntax errors under Linux/Unix using the command-line option.
Source: OpenSSH Tip: Check Syntax Errors before Restarting SSHD Server – nixCraft
Small SSH config change becomes a massive time saver when using a jump (bastion) host
By using ProxyJump in your config on your local SSH client, you can save a lot of time when using a SSH jump (bastion) server before connecting to the target server.
Source: Small SSH config change becomes a massive time saver when using a jump (bastion) host (Claudio Kuenzler)
5 Best PDF editors for Ubuntu and Other Linux
A list of best PDF editors to edit PDF files in Ubuntu and other Linux distributions, including their advantages and features.
Source: 5 Best PDF editors for Ubuntu and Other Linux
Nmap Commands for Beginners: Simple Scanning Tips
Discover 20 essential Nmap command examples for basic scans, port scans, and more. Perfect for beginners looking to get started with Nmap.
Source: Nmap Commands for Beginners: Simple Scanning Tips – LinuxCapable
Complete Guide to Install VirtualBox on Debian Linux
Learn how to install Oracle VirtualBox in Debian Linux (latest version) with additional steps to configure guest additions.
Source: Complete Guide to Install VirtualBox on Debian Linux (DebugPoint.com)
Quickly resize and shrink Raspberry Pi SD card image on MacOS
From time to time you may want to quickly copy a raspberry pi image from one system to another….but only have a smaller SD card. Or you started your project as a tryout on a crazy 64GB sd card, and realize later that 8GB would be way enough. So what you want to do, is resize the source image to the smallest size possible, flash it to the new smaller SD card, and expand it again to its new maximum on the new SD card. And so far that process can be very long and painful….but luckily there is a very handy script for that, called PiShrink. I am using the mac version, but there is also a linux version.
Source: Quickly resize and shrink Raspberry Pi SD card image on MacOS – Florian Müller
Similar article that expands on the one linked above: Flash larger SD card image onto smaller card on Mac for your Raspberry Pi – Medium/Practical coding
Best Free AI Tools That Anyone Can Use [ChatGPT, Dall E-2, Etc]
Top AI tools that anyone can use · ChatGPT · Microsoft Bing AI · Dall E-2 · Midjourney · Stable Diffusion · QuillBot AI · Jasper.ai.
Source: Best Free AI Tools That Anyone Can Use [ChatGPT, Dall E-2, Etc] – Fossbytes
Mox is a modern full-featured open source secure mail server for low-maintenance self-hosted email
Why a new mail server implementation?
Mox aims to make “running a mail server” easy and nearly effortless. Excellent quality mail server software exists, but getting a working setup typically requires you configure half a dozen services (SMTP, IMAP, SPF/DKIM/DMARC, spam filtering). That seems to lead to people no longer running their own mail servers, instead switching to one of the few centralized email providers. Email with SMTP is a long-time decentralized messaging protocol. To keep it decentralized, people need to run their own mail server. Mox aims to make that easy.
Source: Mox (GitHub)
How to limit CPU usage with CPULimit on Ubuntu Linux
Cpulimit is a tool that limits the CPU usage of a process (expressed in percentage, not in CPU time). It is useful to control batch jobs when you don’t want them to eat too many CPU cycles. The goal of cpulimit is to prevent a process from running for more than a specified time ratio. It does not change the nice value or other scheduling priority settings but the real CPU usage.
Source: How to limit CPU usage with CPULimit on Ubuntu Linux
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