For this lesson we are going to fill in a couple of concepts that we will need before we go further with directories. Wildcards can let you look for files and directories without specifying the complete name, and look for items with similar names or file extensions. And file attributes are an important part of file management.

Links:

https://www.ahuka.com/dos-lessons-for-self-study-purposes/dos-lesson-11-dos-wildcards-file-attributes/

In this episode our two ageing heroes take a closer at operating system

(OS) level virtualisation. The main different legacy virtualisation

technologies like virtual machines (VMs) and this new-fangled approach is

that the OS kernel remains the same across virtualisation domains, thus giving

the hippsters and other followers of fashion a cheaper and potentially much

faster solution than virtualising the kernel and surrounding hawrdware and all

the rest of it. Plus more details on Martin's real faith. Don't miss out on

this episode if you're interested in any of these...

Links:

Craíc: https://www.irelandlogue.com/irish-slang/irish-slang.html

Celts: https://en.wikipedia.org/wiki/Celts

Celtic languages: https://en.wikipedia.org/wiki/Celtic_languages#Living_languages

[a-zA-Z]+ Virtualisation: https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/techpaper/VMware_paravirtualization.pdf

Hypervisor: https://en.wikipedia.org/wiki/Hypervisor

BSD Jails: https://docs.freebsd.org/en/books/handbook/jails

Solaris Zones: https://www.oracle.com/technical-resources/articles/it-infrastructure/o11-092-s11-zones-intro.html

Docker: https://docs.docker.com/engine

LXC: https://linuxcontainers.org

Open Container Iniative: https://opencontainers.org

Podman: https://podman.io

Double-fork: http://thelinuxjedi.blogspot.com/2014/02/why-use-double-fork-to-daemonize.html

CRI-O: https://github.com/cri-o/cri-o

CGroups: https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html

Namespaces: https://en.wikipedia.org/wiki/Linux_namespaces

The gory details: http://www.haifux.org/lectures/299/netLec7.pdf

Dockerfiles: https://docs.docker.com/engine/reference/builder

Containerd: https://containerd.io

From Dusk Till Dawn (TV series): https://en.wikipedia.org/wiki/From_Dusk_till_Dawn:_The_Series

Overview

This time I have three main subjects to discuss, all of them dealing with misunderstandings of words:

Mistakes made with homophones, one group of examples

The definition gets a little technical, see the Wikipedia description.

Misunderstandings of words from other languages

Pundit

Looking at Eggcorns (a name chosen from a misspelling of acorn)

Wikipedia: an alteration of a phrase through the mishearing or reinterpretation of one or more of its elements

Long notes

Follow this link to read the detailed notes associated with this episode.

Links

Misunderstanding homophones:

Wikipedia article on homophones

Confusing reign and rein

Definitions of reign:

Free Dictionary: reign

Merriam-Webster: reign

Definitions of rein:

Free Dictionary: rein

Merriam-Webster: rein

Misunderstanding imported words:

Bee Dictionary: pundint or pundit

Definitions of pundit:

Free Dictionary: pundit

Merriam-Webster: pundit

Wikipedia article: Jawaharlal Nehru, aka Pandit Nehru

Eggcorns:

Wikipedia article on Eggcorns

The Eggcorn Database

The Eggcorn Forum

Wikipedia article on Alzheimer’s disease

Cruel, Clever Cat, by Geoffrey Taylor a joke on the Eggcorn baited breath

Previous episodes in this series:

Battling with English - part 1

Battling with English - part 2

Battling with English - part 3

Battling with English - part 4

This is an Emergency show

This show is from the emergency show pool.

You are hearing this because there was a free slot that was not filled.

Hacker Public Radio is a community effort, that will only continue if people like you submit shows.

If you have not submitted a show this year, then please record an introduction about yourself, and how you got into tech.

Then post it to, Hacker Public Radio dot org forward slash, upload.

The Best Eggs in the World

Today's show is brought to you by pokey

1/6 large onion

3-5 medium mushrooms

2 eggs

1-2 slices of cheese

2 pieces of toast

Garlic Powder, Salt, Pepper, butter to taste.

If you have comments, please leave them in the comments section for the show here at http://hackerpublicradio.org

If you had submitted a real episode of HPR, you wouldn't have found this in your feed today. :-P

Response to hpr3568

Title PopKorn Episode 2: Programming, Mathematics, and Asymmetric Literacy

Artist BlacKernel

Album Hacker Public Radio

Comment https://hackerpublicradio.org Clean; in This episOde, blackeRnel Tries to help yoU undeRstand Enough about math and programming The license is CC-BY-SA

Date 2022

Track Number 3568

Genre Podcast

https://en.wikipedia.org/wiki/Mathematical_joke

Mathematicians are also shown as averse to making hasty generalizations from a small amount of data, even if some form of generalization seems plausible:

An astronomer, a physicist and a mathematician are on a train in Scotland.

The astronomer looks out of the window, sees a black sheep standing in

a field, and remarks, "How odd. All the sheep in Scotland are black!" "No,

no, no!" says the physicist. "Only some Scottish sheep are black." The

mathematician rolls his eyes at his companions' muddled thinking and says,

"In Scotland, there is at least one sheep, at least one side of which

appears to be black from here some of the time."[Stewart, Ian (1995).

Concepts of Modern Mathematics. ISBN 9780486134956.]

https://en.wikipedia.org/wiki/Mathematical_proof

A mathematical proof is an inferential argument for a mathematical

statement, showing that the stated assumptions logically guarantee the

conclusion.

Stated assumptions

https://nixnet.social/objects/bc9d7dd8-66a5-4aae-ab21-6f77ad4191d3

BlacKernel @[email protected] Mar 21, 2022, 19:01.

Saying you don't need to know math to do programming is like saying

you don't need to know how to read in order to write. Technically

true, but it makes it way easier.

Simplifying the statement

Knowing math makes programming way easier.

Rearrange and problem

There are no humans that ever existed or will ever exist that will not

find programming easier having a knowledge of maths.

I exist. I do not find programming easier despite my knowledge of maths.

Q.E.D.

other points

"Ability to think logically - which is what math is."

This assumes that math is the only field where the ability to think logically exists. Math is a subset of logical thinking and not the other way around. I can think of hundreds of occupations that require logical thinking that do not require any maths. It would be difficult to argue this point as it could be argued, as most people are exposed to counting no matter what level of literacy they may have access to. So let us refer to studies with crows that shows that they do think logically - despite any math knowledge.

Using the Aesop's Fable Paradigm to Investigate Causal Understanding of Water Displacement by New Caledonian Crows

Tool Manufacture in Crows

Programming is ...

The wikipeda entry has 19 other definitions for programming but OK.

https://en.wikipedia.org/wiki/Program

Asymmetric literacy

"Is an example where you can read or write in a specific language but not necessarily doing both."

Chinese written language can be understood by multiple spoken languages. However the nuance is greater if the writer and rea

Aspire-ing to use 13 year hardware

Dual boot

image = /boot/vmlinuz

root = /dev/sda3

label = Slackware15.0

read-only

image = /boot/vmlinuz

root = /dev/sda2

label = Slackware14.2

read-only

First change

# LILO configuration file

# Append any additional kernel parameters:

append="acpi=ht"

Dropped CPU usage to 50%

Second change

grep . -r /sys/firmware/acpi/interrupts/

/sys/firmware/acpi/interrupts/gpe1D:322734808 STS enabled unmasked

echo "mask" > /sys/firmware/acpi/interrupts/gpeXX

Interrupts

Interrupts

My case was

echo "mask" > /sys/firmware/acpi/interrupts/gpe1D

Dropped usage to 0-5%

Then added the mask to crontab -e under root

Add 'acpi_mask_gpe=0x1D' or whatever interrupt corresponds to the overactive one, and remember to run the lilo command afterward to make the kernel option active.

Htop options for CPU usage

Click the thumbnail to see the full-sized image

Htop display

Upgrades

Fan from AliExpress

https://www.aliexpress.com/item/32861732299.html

Replacement fan

Click the thumbnail to see the full-sized image

2GB DDR2 667MHz SODIMM PC2-5300

https://www.amazon.com/gp/product/B00C53A37K

2Gb ram upgrade

Click the thumbnail to see the full-sized image

Resources

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/kernel_administration_guide/listing_of_kernel_parameters_and_values

acpi=ht

https://www.kernel.org/doc/ols/2005/ols2005v1-pages-59-76.pdf

Use ACPI boot table parsing, but do not enable ACPI interpreter This disables any ACPI functionality that is not required for Hyper Threading.

ACPI (Advanced Configuration and Power Interface) is an open industry specification establishing industry-standard interfaces for OS-directed configuration and power management on laptops, desktops, and servers.

HPR3511 Podman like Vagrant

https://archive.org/details/hpr3511

Everything You Always Wanted to Know About PEX

Part 01- Let's Talk About PEX - Introduction

Why? My story

Why am I posting about plumbing on HPR? "Of interest to hackers"

I find it interesting

We like to learn new things

We like to understand

How things work

How things break

How to use non-standard approached to solve problems

Others can learn from my experience, troubleshooting process, etc...

I had fun creating the episode titles.

Pinhole leaks in copper pipe

Causes – Note plumbing is around 40 years old and original to house

Poor quality copper Shoddy installation

Failure to de-bur pipe before soldering

Not properly hung from joists

Pipe on pipe

Pipe on steel wire

Bad soldering technique

Lumpy solder

Flux residue

Excessive flux

Hard water

Only some neighbors experiencing the same issue, and their houses were constructed by the same builder.

Learn more about copper pipe corrosion

How to Stop Copper Pipe Corrosion - This Old House YouTube Channel

https://www.youtube.com/watch?v=nD5lMITzx_Y

High Water Pressure

Normal = 60-80 PSI

Tested at 63 PSI = GOOD!!

Damage

Water leaks caused damage to drywall in parts of my house and to items stored in my garage.

Leaks in some areas can sometimes go unidentified for long enough to do extensive damage and even lead to dangerous mold growth.

Possible solutions

Short term

Patch

Epoxy kits

Can be inconsistent

May not bond to corroded pipe

Some require turning off water and dry pipes

Water activated tape

Access around pipe

May not bond to corroded pipe

Some require turning off water and dry pipes

Solder on patch

Expensive

Requires clean dry pipe exterior

Requires draining the pipe

Might as well cut out the leaking section and replace

Repair Clamps

Fast

Strong

Can be used while pipe is under pressure

Minimal clearance needed

Examples

https://www.grainger.com/category/plumbing/pipe-tubing-and-fittings/pipe-repair-clamps-and-couplings/pipe-repair-clamps

https://www.homedepot.com/b/Plumbing-Plumbing-Accessories-Repair-Clamps/Copper/N-5yc1vZbqomZ1z0vifv

https://www.homedepot.com/b/Plumbing-Plumbing-Accessories-Repair-Clamps/Multi-Purpose/N-5yc1vZbqomZ1z0vhwh

Long Term

Repair copper

Cut out damaged section and replace using SharkBite fittings

Expensive

Cut out damaged section and solder in new section of pipe

Expensive

Time consuming

Many areas of corrosion visible

Whack-a-mole - Where & when will next leak occur?

New copper

Expensive

Difficult

Time consuming

PVC

Still difficult – rig

admin admin with Lurking Prion

Episode 3: Who the heck is Evil Steve?

Picking up from Episode 2: Good Idea Fairy Hunting we continue exploring the concept of security as a people problem.

This week we stop to take a moment to focus on the Who rather than the What is attacking us. In CyberSecurity, we tend to get caught up in things that happen to us, that we forget that it is actually a person attacking us. Learning more about who wants the information we have will tell us the ways they go about stealing it. This gives us information to better protect our assets and begin active threat hunting. The show is about 15 minutes long.

Links to information about Threat Actors listed below:

https://www.cisa.gov/

https://www.cisa.gov/cybersecurity

https://www.cisa.gov/cert

https://www.csoonline.com/article/3619011/the-10-most-dangerous-cyber-threat-actors.html

https://threatmap.checkpoint.com/

I guess I lost the document from Lanier Tech :( it was hilarious..

Introduction

This episode was prompted by show 3542 from Beeza entitled The Worst Car I Ever Had. Here’s my story.

I moved to Edinburgh in 1981, and before long bought myself a car - the first one I had owned. Before that I’d owned a series of Lambretta motor scooters and small to medium powered motorbikes. I’d been using a bicycle a lot after that.

The car I bought was an oldish Peugeot 104, small, not very powerful, but it did the job. It was fine for driving around town and I used it to go and visit my parents in Norwich, England a few times, a long journey. I once drove north, up to Ullapool, a shorter drive, but it wasn’t the car for long journeys. Mostly it was used around town.

As the Peugeot started to give me trouble I looked around for a replacement. I was visiting my parents and went to a car dealer in Norwich and was shown an Austin Maestro. It was newer than the Peugeot and seemed to be in good condition, so I bought it, trading in the Peugeot as I did so.

The Maestro range was seen as reasonably good as far as I knew, but this one suffered from some design flaws, in my opinion.

The car I bought was only a few years old and had a fairly low mileage. It was the HLE model with a 1.3 litre petrol engine. It had 4 doors and a hatch at the back giving access to a reasonable amount of luggage space (often such hatchbacks are called 5-door cars in the UK). All Maestro models had front-wheel drive, and this one had a manual gearbox. Automatic British cars were not common at that time.

The Maestro had a bunch of economy features:

a 4-speed gearbox with some economy gear ratios

an econometer on the dashboard with green and red LEDs indicating how economically the car was being driven

The Issues

The Maestro seemed to have been designed to be driven as empty as possible. As soon as there were any passengers, or luggage, or both, the car was a nightmare to drive.

There were models in the range that performed well, I think. Being passed by them on motorways and when trying to drive up any kind of hill showed this to be true. I’ve read that the standard 1.3 model was pretty good without the economy features, but I never experienced one.

The problem was that the gap in gear ratios between the second and third gear was enormous, as if you’d accidentally skipped a gear. The fourth economy gear could only be resorted to on flat roads – or going downhill – or with a tail wind – or with the car completely empty.

I was happy to find a link describing these problems when doing research for this show. The description of the car made me laugh, but also brought back memories of the extreme frustration I experienced with this car!

So, I conclude that this particular Maestro was a failure. It might be the reason I got it at a good price; the previous owner was probably keen to get rid of it. Also the car dealer knew a sucker when he saw one, and I was that fool!

I kept the car for a few years, did very few long journeys in it and eventually replaced it with a Vauxhall Astra Mark III, which was in a totally different league!

Links

Peugeot 104

Wikipedia page on the Peugeot 104

Austin Maestro:

Wikipedia page on the Maestro