linux

Again we are back to naming things, the new network device naming policy is very sweet… ...

Let’s build our own Linux operating system for a Raspberry Pi 4 First we need a big build box, something 16 VPC and 32GB RAM from AWS should do the trick. I like this machine: c4.4xlarge Set up the development environment sudo apt update && sudo apt -qy dist-upgrade && sudo apt -qy install gawk wget git diffstat unzip texinfo gcc-multilib build-essential chrpath socat libsdl1.2-dev xterm sed cvs subversion coreutils texi2html docbook-utils python-pysqlite2 help2man desktop-file-utils libgl1-mesa-dev libglu1-mesa-dev mercurial autoconf automake groff curl lzop asciidoc u-boot-tools cpio sudo rsync linux-headers-$(uname -r) locales Additional requirements:...

And we are back to naming things, this is my latest network device naming policy… ...

I wondered if I could use my Raspberry Pi 4 as a gateway device to shape and filter my network traffic. It only has one NIC, but OpenBSD supports many USB-NIC devices out of the box. Let’s see how successful this idea is. Update firmware on Raspberry Pi 4 Instructions here: https://github.com/AshyIsMe/openbsd-rpi4 Installing OpenBSD 6.9 on Raspberry Pi 4 Download and checksum install69.img from the OpenBSD 6.9 FTP site. Put the install69....

Get that lovely Plan9 source feel in your C code on Linux or OpenBSD Kernel Normal Form Kernel normal form 1, or KNF, is the coding style used in the development of code for the BSD operating systems. According to the OpenBSD man pages 2: This file specifies the preferred style for kernel source files in the OpenBSD source tree. It is also a guide for preferred userspace code style....

I find myself Google-ing for command-line fu a lot more than I should, here are some favourites… rsync with ssh Although this should be the default by now, really, who trusts the defaults? Manage it yourself with something like this: rsync -avP -e "ssh -i ssh_key_file -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null" /home/jas/local-dir/* remote-user@webhost.com:/home/server/www/yourdomain.com/ Rainbow Shell Prompt Put this in .bashrc or wherever is appropriate for your OS: export PS1="\[$(tput bold)\]\[$(tput setaf 1)\]\u\[$(tput setaf 208)\]@\[$(tput setaf 3)\h\[$(tput setaf 2)\]:\d \[$(tput setaf 4)\]\@:\[$(tput setaf 55)\]\w\n$PROMPT_COLOR\$ \[$(tput sgr0)\]" YouTube-dl on Linux Obtain it from here: https://github....

Did you know that all of your images contain a bunch of metadata? This is mostly harmless. But actually some of the metadata is not harmless. Dianne Feinstein, an American, famously said, post-Snowden, that “Our courts have consistently recognized that there is no reasonable expectation of privacy in this type of metadata information and thus no search warrant is required to obtain it”. Yikes! Also, note that the EFF have thoughts on fingerprinting of digital cameras, printers, CD ROM burners, and MAC addresses in routing devices....

Raspberry Pi has been through a few revisions now, and the data available on the www tends to get stale very fast. This is the right way of connecting to a Raspberry Pi 4 via a serial consoles. Which GPIO pins are used for the serial console? As can be seen in the image above and the cartoon here, the TX (PIN8) and RX (PIN10) pins for the serial port are next to the 5V power (PIN2) and GND (PIN6) pins on the top left....