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Hacker Public Radio

Your ideas, projects, opinions - podcasted.

New episodes Monday through Friday.

Call for shows

We are running very low on shows at the moment. Have a look at the hosts page and if you don't see "2014-??-??" next to your name, or if your name is not listed, you might consider sending us in something.

hpr queue showing an graph showing how few shows we have

There are no files to process on the FTP server.

Latest Shows

hpr1489 :: Setting up a Raspberry Pi and RaspBMC

Hosted by Curtis Adkins (CPrompt^) on 2014-04-17.
Listen in ogg, spx, or mp3 format. Comments (0)

In this episode CPrompt and his friend Matt go through their entire process of putting together a Raspberry Pi, installing the OS and setting up RaspBMC.


hpr1488 :: What's on My Podcatcher

Hosted by Keith Murray on 2014-04-16.
Listen in ogg, spx, or mp3 format. Comments (1)

After listening to Ahuka describe his favourite podcasts on HPR1479 and HPR1482 I was surprised to see how few of the shows we listen to overlap. There are so many podcasts out there it's always good to be able to get recommendations. I present to you my list of 30 podcasts (I had to cull the list down a bit).

hpr1486 :: Linux Luddites Episode 11 - Interview with Rob Landley

Hosted by Ken Fallon on 2014-04-14.
Listen in ogg, spx, or mp3 format. Comments (0)

This show is is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

As stated on the HPR Contribution page

We will continue to promote new podcasts and other creative commons material but due to a lack of slots, we are only releasing material created exclusively for HPR. If there is a piece of creative commons content that you would like to promote, then feel free to record a regular show where you introduce the content and explain why it is important, providing links to where we can get more information.

Today I am doing just that. As a member of the HPR community, I would like to bring the podcast LINUX LUDDITES with the tag line "Not all change is progress". Taking their name from "Linux" the an operating system kernel by Linus Torvalds, and "Luddites" from the 19th-century English textile artisans who protested against newly developed labour-saving machinery.

I am submitting Episode 11 as it includes a fascinating interview with Rob Landley, former maintainer of BusyBox and covers among other things his experiences of GPL enforcement. For complete episode show notes see

If this podcast is not in your feed, you would do very well to add it.

If there is a show is new to the scene, ie not on the, then contact us about it and also consider submitting an episode as a featured podcast.


hpr1485 :: 26 - LibreOffice Calc Cells

Hosted by Ahuka on 2014-04-11.
Listen in ogg, spx, or mp3 format. Series: LibreOffice | Comments (0)

LibreOffice Calc: Cells

All spreadsheets have the same basic structure, a table of rows and columns. Columns are headed up A, B, C, and so on. After Z, the next column is AA, then AB, AC, AD, and so on. The maximum number of columns is 1024. Rows are numbered 1,2,3 and so on, and the maximum number of rows is 1024*1024, or 1,048,576. At this time I am not aware of any plans to increase these numbers, though that could change if competitive pressures make it necessary.

Where a row and column intersect, there is a cell, which is given the address of the column followed by the row, e.g. A1, but never 1A. This is very useful since you can use the contents of a cell in a calculation by simply using the cell address. For example, to add the value of cell B4 to the value in cell C3 and store it, you would write “=B4+C3″ in the cell where you want to store the sum. Learning to use cell addresses is extremely important, so get in the habit of doing this at every opportunity.

For the rest of this article see

hpr1483 :: HPR Community News for March 2014

Hosted by HPR Admins on 2014-04-09.
Listen in ogg, spx, or mp3 format. Series: HPR Community News | Comments (0)

In today's community news we discuss the happenings in the HPR community. On the mumble were Dave Morris and Ken Fallon, while we were joined by Pokey and NYBill from the North East Linux Fest. During the show we also heard from Bruce Patterson formally of the Distro weekly podcast. x1101 a HPR listener and soon to be new contributor and finally Paul from paul dot com Paul's Security Weekly.

New hosts

There were no new hosts this month.

Running out of shows

We got very few shows lately and were it not for the backup shows been moved into the main queue we would be in trouble.

Queue status showing a big dip in shows

Last Months Shows

id title host
1456 HPR Community News for January 2014 HPR Admins
1457 Xubuntu, Kali on EeePc, Markdown Stuff, Pogoplug 4, and more. Beto
1458 Free Culture and Open Animation Seetee
1459 Locational Privacy with retrotech-the lowly pager deepgeek
1460 The road warrios command line combat life. Knightwise
1461 FOSDEM Keysigning Event Dave Morriss
1462 Encryption and Email with Thunderbird Ahuka
1463 Code Is a Life Sucking Abyss, Also My Story sigflup
1464 HPR Audiobook Club: Space Casey HPR_AudioBookClub
1465 24 - LibreOffice Writer A Brochure Project Ahuka
1466 Thoughts on GPS pokey
1467 How to win Find-The-Difference games pokey
1468 A Whole Lot of Nothing: Chromebook EOL, CentOS WTF, Non Mainstream GNU/Linux Distros and more... Beto
1469 HPR Community News for February 2014 HPR Admins
1470 Learn to read time with ccClock Ken Fallon
1471 Encrypt Your Stuff With Blowfish sigflup
1472 How I Found Linux Curtis Adkins (CPrompt^)
1473 FOSDEM Discussion Dave Morriss
1474 A behind the Curtian Look at OsmAnd (OSM Automated Navigation Directions) with Pokey and David David Whitman
1475 25 - LibreOffice Calc What Is A Spreadsheet Ahuka
1476 Sega Genesis Music Driver sigflup

Mailing List discussions

Policy decisions surrounding HPR are taken by the community as a whole. This discussion takes place on the Mail List which is open to all HPR listeners and contributors. The discussions are open and available on the Gmane archive.

Discussed this month was:

Backup Shows

In a discussion started by Dave Morris. Some felt that the content was getting stale, and keeping shows for 2 years or even 3 months was too long. Others felt that these shows were contributed with the purpose of been used in an emergency and therefore should be timeless.
Eventually it was left to each of the contributors that had shows in the backup queue to release them, or to set them as emergency shows. The website has been updated to reflect this change.


The next audiobook is Shaman Tales Book 1: South Coast by Nathan Lowell. It's available on

wget -O - | xmlstarlet sel -T -t -m '/rss/channel/item/enclosure' -v "@url" -n - | grep 'PB-'| while read chapter;do wget $chapter;done

New Podcasts

Round table

The mumble server is still available for Recording round table discussions Port: 64747

Reserved slots

July 8 is reserved by davidWHITMAN

Usefulness of the Community News Show/Reserved Slot

Last month we asked if the community news should continue - and yes it should. We are open to suggestions on how to improve it.
It was also agreed to allow this show to be reserved.

hpr1482 :: 02 What is on my podcast player

Hosted by Ahuka on 2014-04-08.
Listen in ogg, spx, or mp3 format. Comments (2)

What is on my podcast player

My web site is at h

Remember to support free software!

hpr1481 :: Encryption and Gmail

Hosted by Ahuka on 2014-04-07.
Listen in ogg, spx, or mp3 format. Series: Privacy and Security | Comments (0)

Last time we looked at how you can use GPG and Enigmail to digitally sign or encrypt messages in Thunderbird. But today many people use web-based mail, and one of the most popular is Googles Gmail. Others include and Yahoo, but using any of them is pretty similar. So since I have a Gmail account handy, I will use that to demonstrate encryption in web mail accounts.

The important thing you must keep in mind is that this relies on you using your GPG keys to either sign or encrypt the message before it leaves your computer, what Steve Gibson calls Pre-Interent Encryption, or PIE. The flaw in what Lavabit did (discussed in previous lesson) was to use keys that the mail provider controlled, and these keys could be (and were) demanded by the the government.. If you use your own GPG keys that you control, no provider (Google, in this case) is even capable of giving anything to the government other than a blob of random nonsense.

To do this, I will use an extension for Googles Chrome Browser called Mailvelope. This is also available for Firefox, but in my case I use Chrome to access my Gmail account., so using a Chrome extension makes sense for me. The first thing to do is go to the Chrome store, search for Mailvelope, and install it.

For the remainder of the show notes please see


hpr1480 :: Continuous Ink Supply System

Hosted by Ken Fallon on 2014-04-04.
Listen in ogg, spx, or mp3 format. Comments (0)

The cost of printing

The reason that printers are so affordable is because like game consoles, they are not. They are sold at cost or below cost. The printer manufacturers make their money by selling you replacement ink cartridges that are very expensive. While you can use replacement cartridges, the manufactures will try and dissuade you from using them by displaying messages in the screens to "alert" you to the fact, or will include chips in their printers to prevent you from refilling or swapping their cartridges for cheaper alternatives. You should consider a laser printer option as while the toner cartridges are more expensive, even those supplied by the manufacturers work out cheaper over time. But if you wish to use a Ink Jet, then a serious alternative to lower the cost of printing is to use a CISS, Continuous ink supply system.

CISS, Continuous ink supply system

A CISS, Continuous ink supply system, is a system where you use cheaper non brand ink in your printer, just like you would with replacement no-name brand cartridges. Instead of having to refill the cartridges as they empty you supply them via a thin hose to an external reservoir. The advantage is that you can buy your ink in bulk and refill it without having to open the printer. This brings the cost of printing considerably.

Now to pick a printer

  1. What Functions would you like ?
    In the Netherlands there is an excellent site called that allow you to select devices by their features without having to gather all the information from various review sites that may/may not be influenced by outside forces. Although the site is in Dutch it should be fairly obvious what's been asked. (Google Translate version)
  2. Will it work with Linux
    Once you short list the printer(s) you like, head over to to find out if it's supported by Linux and by extension Mac/iOS. Do this even if you plan to run Windows as it proves that the printer is popular and is likely to be supported.
  3. Will it really work with Linux
    Support is a big word and while it may be trivial for some to recompile a Kernel and X to get the thing working. It saves a lot of time and effort if you look around on the Linux Distributions forums to see if there are reported problems installing the printer. A good search is "${your printer model number} linux howto", check the dates on the posts as well paying more attention to the newer ones. Don't worry if you find a HowTo on another distribution than the one you are using as the chances are good that it will also apply to your install.
  4. Can you easily use replacement cartridges ?
    For to answer this, you will need to search in your local stores and on-line to see if there is a popular replacement option available. You should pay particular care to whither the cartridges require a chip or not.
  5. Is there a CISS option
    Now you need to check for a CISS supplier and to see whither they have a supported model for your printer and if there is instruction videos on how to install them
    For my purposes "City Ink Express" fitted the bill on both counts. They are a UK store and the only purchase I made arrived before the printer I ordered and the ink system seems to work fine.

Brother MFC-J5910DW

I ended up going with the "Brother MFC-J5910DW" as we were looking for a printer that could scan to the network, print A3, A4 duplex, as well as supporting Linux. At the time of writhing the Brother printers do not use any chips and allow you to replace the cartridges. One annoying thing was that when the ink in one of the supplied cartridges went empty (after printing 10 A3 pages), it no longer allowed me to scan to the network. Fortunately I had the CISS system ready to rock and to be honest I was dreading installing it.

Even if you don't want to purchase your CISS system from City Ink Express, you should have a look at their videos. For my printer there were three that were appropriate, namely how to Fill and prime it, how to install it and (for the future) how to refill it. I'm not going to waste time on my experiences as I have nothing to add to the videos other than to say, you may want to put on a pair of gloves and do your work over a news paper to capture any ink that spills.

How to fill and prime brother Ciss for LC980 -LC985 - LC1100 -LC1240 - LC1280

Ciss continuous ink system for Brother LC1220, LC1240, LC1280 Printers

how to top up a brother ciss


I'm not using the system or the printer long enough to give a full review but the CISS system has saved two birthday parties so not a bad start.

The Brother Printer

CISS Supply System