Termius Linux Install Wrapper

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So Termius states it’s provides a Linux client however it’s only a .deb file available which isn’t suitable for other distros (There is also no mention of the distros they support). Luckily the packages do a fairly simple job of it which means it can be extracted and manually installed.

Get the Install Wrapper over at Github Gist.

This script is fairly untested so it might not work as intended. The main aim is to extract the deb file, and then extract the actual application from data; it then removes the Debian/Ubuntu targeted cron job. I have not tested this much and it was only designed to run on Fedora.

I make no recommendations about Termius; this is simply a helpful script for other people that may (like myself) want to evaluate this tool and find that the marketing is not quite the reality.

Discord Linux Installer/Updater for TAR Package

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I’ve written (and now well-tested) a Discord installer for Linux that takes the very nicely packaged tar download and places it in a sensible directory (/opt/Discord), extracts it and then adds app icons into the app launcher. This mainly targets Gnome and I’ve run this on RPM/EL based distros such as Fedora, CentOS and Rocky.

View the Installer Gist

Simply download the script and run it through bash (or simply make it executable); it will install Discord to /opt/Discord, it should also update discord for you if you re-run the script when an update is avaialble. This does expect to be run as root (or with sudo).

Building Slurm on EL8

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More for my own knowledge but SLURM will build on EL8 but requires the PowerTools Repo and Epel Repo.

This short script worked for me.


yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
yum-config-manager --enable CentOS-PowerTools
yum -yq groupinstall "Development Tools"
yum -yq install bzip2-devel MariaDB-devel openssl-devel munge-devel pam-devel perl python3 readline-devel zlib-devel perl-ExtUtils-MakeMaker perl-DBI rpm-build
mkdir ~/build && cd ~/build
wget -q https://download.schedmd.com/slurm/slurm-20.11.8.tar.bz2
rpmbuild -ta slurm-20.11.8.tar.bz2

ZFS On Linux Quota

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As you may know, linux quota tool doesn’t work with ZFS, this is a known issue and I have previously hacked around it but I’ve recently had issues with the very rudimentary ZFS quota script I deployed at work for two reasons:

  1. A new ZFS server was not in LDAP so was unaware of Usernames it only showed UIDs
  2. Partial matches on Usernames caused weirdness
ZFS on Linux Logo

So I moved to change the script a little, it now outputs as UIDS, this has an advantage that the server does not need to know the usernames, so you can have local users on remote servers etc. It also makes the output more obscure, due to it being readable by all, it containing names meant it could leak some personal details to systems that do not include the ability to view it.

This change meant that the new server output and client reader is incompatible with the old, so the previous version is now labelled as v1. Due to this breaking change, I thought it would be best to split the code out from my monolithic git repo to it’s own zfs-quota repository meaning others can contribute easier.

The change also highlighted that the UID output (previously name) could partial match, the previous version just hoped and user some poor-mans greping to only output a single match. Using UID also meant that the UID could possibly match a ZFS Byte output. So the new version actually checks the UID field and will only return if that value is a complete match to the UID the system is searching for.

ZFS Quota Output

So please find my ZFS on Linux Quota scripts on github, there’s a Server script and a client script, both of which are targeting CentOS7, and they at least work on Fedora 32/33/34 as well as CentOS8 but they should work on pretty much any Linux distro. Hopefully the client script is simple enough for others to understand and if required port to Windows or MacOS.

Poor-Man’s Raspberry Pi Web based Digital Signage

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There’s lots of Raspberry Pi Digital Signage software suites available but most of them expect you to pay or are really out-dated.

This is a short guide on how to setup a small fleet of Raspberry Pis (Although most of the content applies to any Linux based system).

Simple Steps:

  • Image your System – Raspberry Pi OS or Other Linux.
  • Make sure your system displays correctly on your screen.
  • Install Chromium or Google-Chrome.
  • Run Chrome in Kiosk Mode.
  • Restart Chrome every x minutes.
  • Physically install your screen and pi.

I intend to run multiple systems to display different information signs with some of the systems being out of reach so they needed to be fairly robust stand-alone setup; if I wanted to change the content being displayed, then I needed a way to reconfigure this without having to re-image the raspberry pi or remove the signs.

The Signage Script

The signage bash script will try to detect the system mac address of the two possible system interfaces on a Raspberry Pi (feel free to add/edit these). The start url loads the web server php scripts below to allow changing of content at a later date. It will also detect google-chrome or chromium on the system and use which ever it finds.

The script runs in a loop, showing the web page for 30minutes (can be configured to anything else) and then restarts the browser; this means if there is an issue with network connectivity then you dont need to restart the entire system, it will be back in 30minutes or less.

# Horrible Digital Signage Startup Script
# 2021 - Adam Boutcher - aboutcher.co.uk

REFRESH=30 #Minutes
INTERFACES=(eth0 wlan0)

# Function to check that a binary exists
function check_bin() {
  which $1 1>/dev/null 2>&1
  if [[ $? -ne 0 ]]; then
    echo "$1 cannot be found. Please install it or add it to the path. Exiting."
    exit 1

check_bin which
check_bin cat
check_bin awk
check_bin sleep
check_bin kill
check_bin echo
check_bin ethtool

# Looping through listed interfaces
for INT in ${INTERFACES[@]}; do
  if [[ $(cat /sys/class/net/$INT/operstate 2>/dev/null) == "up" ]]; then
    MAC=$(/usr/sbin/ethtool -P $INT | awk '{print $3}');

if [ -z $MAC ]; then
  echo "No MAC address found"
  exit 1

echo Poor-Mans Digital Signage
echo Adam Boutcher - www.aboutcher.co.uk
echo System MAC: $MAC
echo Starting URL: $STARTURL
echo Refresh in: $REFRESH Minutes

BROWSERS=("google-chrome" "chromium")
for BROWSER in ${BROWSERS[@]}; do
  which $BROWSER >/dev/null 2>&1
  if [ $? -eq 0 ]; then
    echo Found Browser: $BROWSER

while true; do
  $BROWSER --new-window --kiosk --ingognito $STARTURL?mac=$MAC >/dev/null 2>&1 &
  if [ -z $WEBPID ]; then
    echo "First Start"
    sleep 0.5
    kill -9 $WEBPID 2>/dev/null
  echo Running on PID: $WEBPID
  echo "Sleeping..."
  sleep $((REFRESH*60))
  echo "Restarting"

The Web Server Script

This a simple php logic script to redirect the system to your actual web content. This means that upon restart of the web browser, it will re-check this web server script for its content location.


// This array is key = mac, dest = value
$CLIENTS = array (
                "dc:a6:32:zz:yy:xx" => "https://example.com",
                "dc:a6:32:xy:zx:yz" => "https://aboutcher.co.uk",
if ( isset($CLIENTS[$_GET['mac']]) ) {
  header("HTTP/1.1 302 Found");
  header('Location: '.$CLIENTS[$_GET['mac']]);
} else {
  echo "System not recognised.<br/>";
  if ( !empty($_GET['mac']) ) {
    echo $_GET['mac'];
  } else {
    echo "No mac";


Raspberry Pi Auto Start:

Save this file in /home/pi/.config/autostart/signage.desktop

[Desktop Entry]
Name=Digital Signage

Raspberry Pi Tweaks:

You can disable screen blanking in the Raspberry Pi Configuration GUI as well as enable auto-gui and auto-login.

I would also recommend disabling SSH and VNC if remote access isn’t required; you can also enable the filesystem to be read-only which should save the SD card’s life span.

Save the signage script into /home/pi/digitalsignage.sh and then add the autostart script to /home/pi/.config/autostart/signage.desktop, you might need to make the autostart directory.

The raspberry pi is a nice simple solution as they’re easy to get hold of and has a large community to help you get things perfect, there’s also nice features for display rotation and a host of ways to add hacks, so for instance you could add temperature probes and display the temperature results locally.