What is tcpdump? TCP (Transmission Control Protocol) is a communication standard that devices use to talk establish communications between each other. The communication then takes place in packets. Normally a lot of the communication between devices is hidden away from us humans as we don't need to see our computer ask a DNS server for … Continue reading TCPDump (Raspberry Pi)
If you have multiple Linux devices (e.g. Raspberry Pis) you may find it helpful to set up an apt cache to help with updates, especially if you have a poor internet connection or limited data allowance. An apt cache works by caching (i.e. saving) all the updates on one device so that other devices can … Continue reading Using A Raspberry Pi As An Apt Cache (Raspberry Pi)
If you grew up in the early 90's you may remember computing magazines that came with game programming code typed up inside, so that you the reader could type it into your computer and play the game. I'll admit this was always a bit "hit and miss" when I attempted it, which could have been … Continue reading Code The Classics Volume 1 Review (Python)
If you have multiple Linux devices (e.g. multiple Raspberry Pi computers) and multiple user accounts that need access to those devices (i.e. maybe a Code Club of pupils) and want their own user accounts on the devices it could be a lengthy process managing the accounts and devices. Which is where Ansible (https://www.ansible.com/) comes into … Continue reading Using Ansible To Create And Manage Users (Linux / Raspberry Pi)
Imagine that you are a software company and host an awesome free piece of software. One day your site is hacked and the download file for your software is replaced with a malicious version of the software. It might be days (or longer!) before you notice. Or what if someone is intercepting traffic and altering … Continue reading SHA256 File Hash Values And How To Check Them (Raspberry Pi / Mac OS X / PowerShell)
When you connect to a system via SSH a banner of text is displayed. Today I am going to look at changing the default SSH banner text on my Raspberry Pi 4 (Raspbian Buster). The default Raspbian Buster SSH banner looks like this: This banner contains: Information about the system via Pluggable Authentication Modules (PAM) … Continue reading SSH Banner Text (Raspbian)
PowerShell Core is a version of PowerShell that can be installed on Windows, Mac OS X (I covered it here) and Linux, i.e. Raspbian. For this blog post I am going to using my Raspberry Pi 4 and Raspbian (Buster). "PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line … Continue reading Installing PowerShell Core on Raspbian (Raspberry Pi)
The command line / Terminal is a fantastically powerful piece of technology and today I am going to share some of the shortcuts / facts I have learned to help speed up your usage of it. These shortcuts / facts should work on a Raspberry Pi, most Linux systems and Mac OS X's Terminal. Navigating … Continue reading Command Line Fun (Raspberry Pi / Mac OS X Terminal)
Today I am looking at some commands to quickly get up and running on GitHub using a Raspberry Pi. The same instructions should work within other Linux based terminals and Mac OS X (minus apt-get). Wikipedia says that Git is: "...a distributed version-control system for tracking changes in source code during software development.It is designed … Continue reading Introduction To GitHub (Raspberry Pi)
I regularly use SSH (Secure Shell) to control the various Raspberry Pis that I have set up as none of them are connected to a monitor / keyboard / mouse and it provides easy access from my laptop. Note: The first piece of advice when using SSH with Raspbian is to make sure the default account … Continue reading Changing SSH Port (Raspberry Pi)
