Layer Modes, sometimes called Blending Modes, allow you to combine layers in a variety of ways. We continue with the Lighten Modes, except for Dodge which we will cover in the next tutorial along with Burn. These are the Layer Modes available on the latest (at the time I write this) version of GIMP, 2.10.24.

Links:

https://en.wikipedia.org/wiki/Luma_(video)

https://blog.johnnovak.net/2016/09/21/what-every-coder-should-know-about-gamma/

https://www.youtube.com/watch?v=Ijwb1R07aa0

https://docs.gimp.org/2.10/en/gimp-concepts-layer-modes.html

https://www.ahuka.com/gimp/lighten-layer-modes/

In this episode, Martin and Chris host an eclectic panel of contributors to

the *other* major FLOSS operating system family - you guessed it: the

flavours of the Berkeley Software Distribution (aka BSD among friends).

Disclaimer: you may be tempted to diverge from the Path of the

Righteousness also known as Linux and give this alternative a spin. So

this episode is *not* for the faint-hearted - listen at your own

discretion! Also: the true defective nature of our beloved (?) hosts' past

will be revealed - an episode not be missed despite the caveat! Plus

a refresher on spaced-out operating system concepts including library

operating systems and a rant on Android and friends. In addition to some

cool BSD trolling...

Links:

OpenBSD: https://www.openbsd.org

FeeBSD: https://www.freebsd.org

NetBSD: https://www.netbsd.org

DragonFlyBSD: https://www.dragonflybsd.org

386BSD: https://www.386bsd.org

RUMP kernel: https://en.wikipedia.org/wiki/Rump_kernel

Library operating systems: https://www.sigarch.org/leave-your-os-at-home-the-rise-of-library-operating-systems

Free BSD Linux Compatibility: https://docs.freebsd.org/en/books/handbook/linuxemu

BSD Jails (original paper): https://papers.freebsd.org/2000/phk-jails.files/sane2000-jail.pdf

FeeBSD Ports: https://www.freebsd.org/ports

NetBSD pkgsrc: https://www.netbsd.org/docs/pkgsrc

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

BSD's pledge: https://unix.stackexchange.com/questions/410056/what-is-openbsds-pledge-in-short

FreeBSD and Netflix: https://papers.freebsd.org/2019/fosdem/looney-netflix_and_freebsd

BSD Firewalls: https://docs.freebsd.org/en/books/handbook/firewalls

Michael W. Lucas' "Savaged by Systemd": hhttps://www.goodreads.com/book/show/36190710-savaged-by-systemd

Linux vs. Minix: https://www.oreilly.com/openbook/opensources/book/appa.html

Pegasus spyware: https://en.wikipedia.org/wiki/Pegasus_(spyware)

BSD History presentation: https://www.youtube.com/watch?v=DEEr6dT-4uQ

The tragedy of systemd: https://www.youtube.com/watch?v=o_AIw9bGogo

The Rise and Fall of Copyleft: https://archive.org/download/OhioLinuxfest2013/24-Rob_Landley-The_Rise_and_Fall_of_Copyleft.mp3

Here are links to all the search engines and related stuff discussed during this podcast,

Searx: https://www.searx.me/

Searx public instances: https://searx.space/

Whoogle: https://github.com/benbusby/whoogle-search

Whoogle public instances: https://github.com/benbusby/whoogle-search#public-instances

MetaGer: https://metager.org/

MetaGer browser extensions: https://metager.org/plugin

MetaGer mobile apps: https://metager.org/app

MetaGer privacy policy: https://metager.org/datenschutz

Gigablast: https://gigablast.com/

Gigablast privacy policy: https://gigablast.com/privacy.html

Private.sh: https://private.sh/

Private.sh privacy policy: https://private.sh/extension.html

Ecosia: https://www.ecosia.org/

Ecosia mobile apps: https://info.ecosia.org/mobile

Ecosia privacy policy: https://info.ecosia.org/privacy

Startpage: https://www.startpage.com/

Startpage privacy policy: https://www.startpage.com/en/search/privacy-policy.html

Qwant: https://www.qwant.com/

Qwant Junior: https://www.qwantjunior.com/

Qwant browser extensions: https://help.qwant.com/help/qwant-search/add-qwant-on-desktop/

Qwant privacy policy: https://about.qwant.com/en/legal/confidentialite/

Brave Search: https://search.brave.com/

Brave Search privacy policy: https://search.brave.com/help/privacy-policy

DuckDuckGo: https://duckduckgo.com/

DuckDuckGo browser extensions & apps: https://duckduckgo.com/app

DuckDuckGo privacy policy: https://duckduckgo.com/privacy

hpr0773 :: Interview with Gabriel Weinberg of DuckDuckGo

Klaatu asked us what document format we like and why, so this is a response to his podcast. In this podcast I talk about HTML and the importance of good document structure.

table td.shrink {

white-space:nowrap

}

New hosts

Welcome to our new hosts:

CoGo,

BlacKernel.

Last Month's Shows

Id

Day

Date

Title

Host

3413

Wed

2021-09-01

Bash snippet - using coproc with SQLite

Dave Morriss

3414

Thu

2021-09-02

Critical Thinking may make You Critical of the Covid Crisis

CoGo

3415

Fri

2021-09-03

Hacking Stories with Reacted: part 3

operat0r

3416

Mon

2021-09-06

HPR Community News for August 2021

HPR Volunteers

3417

Tue

2021-09-07

Ceph cluster hardware

Daniel Persson

3418

Wed

2021-09-08

My gEeeky Experiment - Part 2

Claudio Miranda

3419

Thu

2021-09-09

Linux Inlaws S01E38: Tiny kernels

monochromec

3420

Fri

2021-09-10

Normal Layer Modes: Erase, Merge, and Split

Ahuka

3421

Mon

2021-09-13

BlacKernel's Journey Into Technology: Episode 1

I talk about some old old old pentesting stories from days old!

Install CentOS or Debian on a Raspberry Pi. I'm using CentOS, but I'll admit that Debian is the easier option by far.

Do this on 3 separate Pi units, each with the same specs.

Set hostnames

You must have unique hostnames for each Pi. Without unique hostnames, your cluster cannot function.

There are several "kinds" of hostnames, so to avoid confusion I change all of them.

I use a simple naming scheme: k for "kubernetes" + an integer, starting at 100 + c for "cluster":

$ sudo hostname k100c

$ sudo sysctl kernel.hostname=k100c

$ sudo hostnamectl set-hostname k100c

$ sudo reboot

Do this for each Pi. At a minimum, you end up with Pi computers named k100c, k101c, and k102c.

Set verbose prompts

When working with many different hosts, it's helpful to have a very verbose prompt as a constant reminder of which host you're connected to. Add this to the ~/.bashrc of each Pi:

export PS1='[\033[1;32m]! d t h:w n% [\033[00m]'

Install a Pi finder script

Install an LED blinker so you can find a specific Pi when you need one. This brilliant script is by Chris Collins for his article Use this script to find a Raspberry Pi on your network, which explains how to run it.

#!/bin/bash

set -o errexit

set -o nounset

trap quit INT TERM

COUNT=0

LED="/sys/class/leds/led0"

if ! [ $(id -u) = 0 ]; then

echo "Must be run as root."

exit 1

fi

if [[ ! -d $LED ]]

then

echo "Could not find an LED at ${LED}"

echo "Perhaps try '/sys/class/leds/ACT'?"

exit 1

fi

function quit() {

echo mmc0 >"${LED}/trigger"

}

echo -n "Blinking Raspberry Pi's LED - press CTRL-C to quit"

echo none >"${LED}/trigger"

while true

do

let "COUNT=COUNT+1"

if [[ $COUNT -lt 30 ]]

then

echo 1 >"${LED}/brightness"

sleep 1

echo 0 >"${LED}/brightness"

sleep 1

else

quit

break

fi

done

Install K3s on your control plane

K3s is Kubernetes for IoT and Edge computing. It's the easiest, cleanest, and most serious method of getting Kubernetes on an ARM device. You can try other solutions (Microk8s, Minikube, OXD, and so on), but the best support comes from k3s.

First, you must install k3s on one Pi. You can use any of your Pi units for this, but I use host k100c because it's the first in the sequence, so it feels logical.

[k100c]$ curl -sfL https://get.k3s.io -o install_k3s.sh

[k100c]$ chmod 700 install_k3s.sh

Read the script to ensure that it seems to do what you expect, and then:

[k100c]$ ./install_k3s.sh

After installation, you're prompted to add some arguments to your bootloader. Open /boot/cmdline.txt in a text editor and add cgroup_memory=1 cgroup_enable=memory to the end of it.

console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p3 rootfstype=ext4 elevator=deadline rootwait cgroup_memory=1 cgroup_enable=memory

Reboot:

[k100c]$ sudo reboot

Once the Pi is back up, verify that your node is ready:

[k100c]$ k3s kubectl get node

NAME STATUS ROLES AGE

k100c Ready control-plane,master 42s

This Pi is the "control plane", meaning it's the Pi

This podcast was provided by Zen_Floater2 in his personal capacity. The opinions expressed in this podcast are the author's own and do not reflect the view of Hacker Public Radio.

Shownotes Edited by Ken on 2021-09-11T14:35:19Z to include disclaimer.

A Squirrels thoughts about freedom and RMS.

I also cover guns on aircraft. I cover smoking on aircraft.

And I cover drinking beer on aircraft.

And COBOL as well.

Previous episode: https://hackerpublicradio.org/eps.php?id=3412hpr3412 :: Reading a license: Creative Commons Attribution ShareAlike 3.0 Unported

Timeline

2007-02-23 https://creativecommons.org/2007/02/23/version-30-launched/

2007-09-26 https://www.gnu.org/licenses/gpl-3.0.html

2011-11-03 https://creativecommons.org/2011/11/03/copyright-experts-discuss-cc-license-version-4-0-at-the-global-summit/

Internationalization

Interoperability

Long-lasting

Data/PSI (Public Sector Information?)/Science/Education

Supporting Existing Adoption Models and Frameworks

2013-11-25 https://creativecommons.org/2013/11/25/ccs-next-generation-licenses-welcome-version-4-0/

30-day violation grace periodhttps://creativecommons.org/faq/#how-can-i-lose-my-rights-under-a-creative-commons-license-if-that-happens-how-do-i-get-them-back

2013-12-06 16Z--18Z CC site moves to 4.0 -- last snapshot with 3.0 is https://web.archive.org/web/20131206155520/http://creativecommons.org/

2014-10-21 CC-by-SA 4.0 and Free Art License 1.3 defined as two-way compatible licenseshttps://creativecommons.org/2014/10/21/big-win-for-an-interoperable-commons-by-sa-and-fal-now-compatible/

2015-10-08 GPLv3 defined as a one-way compatible license for CC-by-SA 4.0https://creativecommons.org/2015/10/08/cc-by-sa-4-0-now-one-way-compatible-with-gplv3/

Links to license and deed and links from within the texts

https://creativecommons.org/licenses/by-sa/4.0/

https://creativecommons.org/licenses/by-sa/4.0/legalcode

The text of the Creative Commons public licenses is dedicated to the public domain under the CC0 Public Domain Dedication.

https://freedomdefined.org/Definition of Free Cultural Works

https://wiki.creativecommons.org/License_Versions#Detailed_attribution_comparison_chartHow to give credit

https://wiki.creativecommons.org/License_Versions#Modifications_and_adaptations_must_be_marked_as_suchHow to mark a work as modified

https://wiki.creativecommons.org/FAQ#If_I_derive_or_adapt_material_offered_under_a_Creative_Commons_license.2C_which_CC_license.28s.29_can_I_use.3FHow and when you can relicense a work

h

Talking Points

Rational

Sometimes, X.org just doesn't want to work

Esspecially if you are a dumb n00b running Arch

The terminal will always be there for you.

Applications:

My .bashrc:

Environment Variables:

export EDITOR=nvim

export PAGER=most

export BROWSER=lynx

export XDG_DATA_HOME="$HOME/.local/share"

export XDG_CONFIG_HOME="$HOME/.config"

PS1: user@hostname:~ (git_branch) $

if [[ $EUID == 0 ]]; then

export PS1="[e[1;31m]u[e[m]@[e[0;32m]h[e[m]:w$(__git_ps1) # "

else

export PS1="[e[1;34m]u[e[m]@[e[0;32m]h[e[m]:w$(__git_ps1) $ "

fi

Aliases:

alias vim=nvim

alias play=mpv

Productivity ("Window Manager"): tmux

Provides an easy way of splitting a tty into various panes

Get multiple workspaces for free with CTL+ALT+F{1,2,3,4,5,6,7}

All of the tiling window manager, none of the X-it

Can set up if [ -t 0 ] && [[ -z $TMUX ]] && [[ $- = *i* ]]; then exec tmux; fi in .bashrc in order to have tmux start/stop with your terminal sessiion.

Music: cmus

Easy library and playlist management

Dead simple to use (with cmus-tutorial)

y to yank songs onto a playlist

SPA to select a playlist

RET to play a song/playlist

TAB to switch between panes

Pictures: fim

Requires user be in the video group for permission to use the Linux framebuffer

Radio/Video/single audio files: mpv

Can display video in terminal (badly with libcaca)

Can actually display video in linux framebuffer (with drm)

Can handle all of your somafm files/web-video links

Requires youtube-dl for video

Podcasts/RSS: newsboat/podboat

Orginizes all of your podcasts and RSS feeds into an easy-to-use ncurses interface

Can be set up with player "mpv --save-position-on-quit" to save positions on podcasts

Very convinent for articles, less so for podcasts

Really needs better integration with something like cmus

Runner Up: podfox

Can be configured with JSON

Has better directory structure than podboat, imo

Tree based structure vs shove everything in ~ by default

Text Editing/Word Processing: neovim/GitX Flavored Markdown/pandoc

Clean modal editing

Can export to whatever with pandoc

Probably not as good as OrgMode if emacs wasn't the HFS+ of text editors

Audio Recording/Post-Processing: ffmpeg

One alias and three scripts in my .bashrc

record: alias record="ffmpeg -f alsa -channels 1 -i hw:1"

atrim, top-tail, and anorm: Allows me to quickly spin up a recording and run post processing

functi