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1. sudo apt install libu2f-udev
2. Download u2f.rules file
3. Save the downloaded file under /etc/udev/rules.d/
4. Upon system reboot, U2F should be available (say from Chromium browser)

Credits to Angela for the article Using Your U2F YubiKey with Linux

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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# Find most common sacs commands across modules, 2020 ckunte
import re
from collections import Counter
# read a file containing all sacs commands
commands = re.findall(r'\w+', open('sacs-commands-all.txt').read())
# print 85 most common commands across all sacs modules
mcom = Counter(commands).most_common(85)
for com, nos in mcom:

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USFOS on linux

As a commercial (engineering) software, [USFOS][u] needs to be manually installed. I tried this today on [elementary OS][e], powered by frugal hardware, and USFOS runs just fine. At minimum, the following are needed:

1. usfos, xact binary, and usfos_etc files.
2. A valid license usfos.key file.
3. A computer with Linux 64-bit OS to run on.

As each binary needs to be separately downloaded from USFOS site, I’ve automated this via [wget][]. Here are the commands to run in a terminal:

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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
"""Generate formatted model data from CSV file
2020 ckunte

Usage: gendata.py --fn=filename.ext
       gendata.py --help
       gendata.py --version

Options:

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Brother HL-L2321D as a network-enabled AirPrint printer

Brother HL-L2321D does one thing and does it well. It's fast, prints duplex, and is lean on cartridge usage. Its drivers are available for MacOS and Windows 10, and so installing it is a breeze. Despite the fact that it has one USB port for interface, making this printer accessible (a) over network and (b) on iOS devices is easy too. This requires setting up a print server. Here's why: The key difference between a non-network and a network printer is that the latter not only features hardware (viz., a network port and / or a wireless chip) but that it also has a print server built-in to the printer itself. These missing features in a non-network printer can easily be outsourced to, say, a Raspberry Pi, which may in fact make this a more capable printer than an off-the-shelf network printer.

Setting up a print server on Raspberry Pi

Connecting it to a Raspberry Pi on your home network to enable sharing requires a little work, but when done, it mak

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#!/usr/bin/env bash
sudo find / -depth -name ".DS_Store" -exec rm {} \;
#
# Run these periodically via a cronjob. Type `sudo crontab -e` in
# a Terminal and enter the following job.
#
# 0 9 * * * root find / -name ".DS_Store" -depth -exec rm {} \;
#
# What this job does:
# At 9AM everyday (in the example below), root looks for .DS_Store 

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{% from 'site_settings.jinja2' import site_title, site_author, site_url -%}
<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">

  <title>{{ site_title }}</title>
  <link rel="alternate" type="text/html" href="{{ site_url }}"/>
  <link rel="self" type="application/atom+xml" href="{{ site_url }}/atom.xml"/>
  {%- for entry in entries -%}
  {%- if loop.index < 1 + 1 %}
  <updated>{{ entry.year }}-{{ entry.month }}-{{ entry.day }}T{{ entry.hour }}:{{ entry.minute }}:{{ entry.second }}Z</updated>

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{% from 'site_settings.jinja2' import site_title, site_author, site_url -%}
{
  "version": "https://jsonfeed.org/version/1",
  "title": "{{ site_title }}",
  "description": "Description of the website",
  "home_page_url": "{{ site_url }}",
  "feed_url": "{{ site_url }}/feed.json",
  "author": {
    "name": "{{ site_author }}",
    "url": "{{ site_url }}"