HPR4299: Building your own Debian images for your Raspberry Pi

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Sidhu Moose Wala explodes onto the Canadian music scene. His sound is a fusion of two worlds - hip-hop with the poetic language of rural Punjab, where he is from. After years of struggle he’s making it. But with the spotlight comes a dark side. As his fame grows, so do the threats. "We will kill you." Presented by broadcaster and DJ Bobby Friction and investigative journalist Ishleen Kaur. Season 8 of World of Secrets, The Killing Call, is a BBC Eye investigation for the BBC World Service. Archive audio credits: Lovepreet Waraich, Malwa TV, BritAsia TV, MPHONE Canteeni Mandeer, GK Digital, Thakur Media, Capital Extra, Famous Punjab TV, ModernSings, Dheeth.jeha, RealRohitBlogs, Mirror Now, India Today. Here’s a link to the BBC Eye two-part documentary films, which we recommend you watch after listening to this podcast: https://bit.ly/thekillingcall If you are in the UK, you can watch on iPlayer: https://www.bbc.co.uk/programmes/m002f18y…

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On https://raspi.debian.net/ one time the image was broken, so I had to built it myself. https://salsa.debian.org/raspi-team/image-specs The makefile can create you a yaml file for your pi model and your release of Debian. Then you can edit that file to do whatever you want to the system, before making it into an image. For example: - In the section apt/packages, add sudo. - Create a user, add it to the sudo group, with password "" and /bin/bash for shell - Create a .ssh for your user, and echo in your SSH public keyboard That way you can boot into your new Debian system without having to have a screen. As soon as you login, the first thing you should do is reset your own password. By doing -p "" we set the password to empty. If we had not done -p "" the password would have been empty but locked, so you wouldn't be able to sudo. Also go ahead and lock your root user password, which you could also do from the file. Build your image, and go.

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HPR4299: Building your own Debian images for your Raspberry Pi

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1
HPR4405: What did I do at work today?

23 hours тому

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This show has been flagged as Explicit by the host. This is about developing Visual Basic classes for a web application. The classes access an SQL Server database via Stored Procedures. Tests.vb Private Sub ResourceTypeTests() ResourceTypeAddTest() ResourceTypeGetTest() End Sub Private Sub ResourceTypeAddTest() Dim fake As New Fake Console.WriteLine("Adding resource type") Console.WriteLine() Dim objResourceType As New ResourceType With { .ResourceTypeID = 0, .ResourceTypeName = fake.Noun } OutputResourceType(objResourceType) Dim ResourceTypeID As Integer = objResourceType.Add() Console.WriteLine("Added Resource Type ID " & ResourceTypeID) Console.WriteLine() Console.WriteLine("Modifying resource type with ID " & ResourceTypeID) Console.WriteLine() fake = New Fake With objResourceType .ResourceTypeID = ResourceTypeID .ResourceTypeName = fake.Noun End With Console.WriteLine("Modification") OutputResourceType(objResourceType) Dim newResourceTypeID As Integer = objResourceType.Add() Console.WriteLine("Modified ResourceTypeID " & newResourceTypeID) Console.WriteLine() End Sub Private Sub ResourceTypeGetTest() Console.WriteLine("Fetching resource types") Console.WriteLine() Dim objResourceType As New ResourceType() Dim ResourceTypeList As List(Of ResourceType) = objResourceType.GetResourceTypes() For Each ResourceType As ResourceType In ResourceTypeList OutputResourceType(ResourceType) Next End Sub Private Sub OutputResourceType(ResourceType As ResourceType) Console.WriteLine("Resource Type ID " & ResourceType.ResourceTypeID) Console.WriteLine("Resource Type Name " & ResourceType.ResourceTypeName) Console.WriteLine() End Sub ResourceType.vb Public Class ResourceType Private m_ResourceTypeID As Integer Private m_ResourceTypeName As String Private ReadOnly dataFields As New List(Of String) From { "ResourceTypeID", "ResourceTypeName" } Private ReadOnly objFields = dataFields Dim objGlobals As New Globals Dim _ConnectionString As String = objGlobals.getConnectionString() Property ResourceTypeID As Integer Get ResourceTypeID = m_ResourceTypeID End Get Set(value As Int32) m_ResourceTypeID = value End Set End Property Property ResourceTypeName As String Get ResourceTypeName = m_ResourceTypeName End Get Set(value As String) m_ResourceTypeName = value End Set End Property Public Function Add() As Int32 Dim ReturnValue As Int32 Try ReturnValue = StoredProcOutInt( _ConnectionString, "dbo.ResourceType_Add", Me, dataFields, objFields, "NewResourceTypeID" ) Catch ex As Exception ErrorRecorder("Resource.Add", ex.Message, ex.Data.ToString) ReturnValue = 0 End Try Return ReturnValue End Function Public Function GetResourceTypes() As List(Of ResourceType) Dim ObjResourceTypes As New List(Of ResourceType) Try StoredProc(Of ResourceType)( _ConnectionString, "dbo.ResourceType_Get", dataFields, objFields, ObjResourceTypes ) Catch ex As Exception ErrorRecorder("ResourceType.GetResourceTypes", ex.Message, ex.Data.ToString) End Try Return ObjResourceTypes End Function End Class ResourceType_Add.sql SET QUOTED_IDENTIFIER ON GO SET ANSI_NULLS ON GO CREATE PROCEDURE [dbo].[ResourceType_Add] @ResourceTypeID INT, @ResourceTypeName NVARCHAR(100), @NewResourceTypeID INT OUTPUT AS BEGIN SET NOCOUNT ON; IF @ResourceTypeID = 0 BEGIN INSERT INTO dbo.ResourceType ( ResourceType_Name ) VALUES ( @ResourceTypeName ) SET @NewResourceTypeID = SCOPE_IDENTITY() END ELSE BEGIN UPDATE dbo.ResourceType SET ResourceType_Name = @ResourceTypeName WHERE ResourceTypeID = @ResourceTypeID SET @NewResourceTypeID = @ResourceTypeID END END GO ResourceType_Get.sql SET QUOTED_IDENTIFIER ON GO SET ANSI_NULLS ON GO CREATE PROCEDURE [dbo].[ResourceType_Get] AS BEGIN SET NOCOUNT ON; SELECT ResourceTypeID AS ResourceTypeID, ResourceType_Name AS ResourceTypeName FROM dbo.ResourceType END GO Provide feedback on this episode .…

1
HPR4404: Kevie nerd snipes Ken by grepping xml

2 дні тому

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This show has been flagged as Explicit by the host. More Command line fun: downloading a podcast In the show hpr4398 :: Command line fun: downloading a podcast Kevie walked us through a command to download a podcast. He used some techniques here that I hadn't used before, and it's always great to see how other people approach the problem. Let's have a look at the script and walk through what it does, then we'll have a look at some "traps for young players" as the EEVBlog is fond of saying. Analysis of the Script wget `curl https://tuxjam.otherside.network/feed/podcast/ | grep -o 'https*://[^"]*ogg' | head -1` It chains four different commands together to "Save the latest file from a feed". Let's break it down so we can have checkpoints between each step. I often do this when writing a complex one liner - first do it as steps, and then combine it. The curl command gets https://tuxjam.otherside.network/feed/podcast/ . To do this ourselves we will call curl https://tuxjam.otherside.network/feed/podcast/ --output tuxjam.xml , as the default file name is index.html. This gives us a xml file, and we can confirm it's valid xml with the xmllint command. $ xmllint --format tuxjam.xml >/dev/null $ echo $? 0 Here the output of the command is ignored by redirecting it to /dev/null Then we check the error code the last command had. As it's 0 it completed sucessfully. Kevie then passes the output to the grep search command with the option -o and then looks for any string starting with https followed by anything then followed by two forward slashes, then -o, --only-matching Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line We can do the same with. I was not aware that grep defaulted to regex, as I tend to add the --perl-regexp to explicitly add it. grep --only-matching 'https*://[^"]*ogg' tuxjam.xml http matches the characters http literally (case sensitive) s* matches the character s literally (case sensitive) Quantifier: * Between zero and unlimited times, as many times as possible, giving back as needed [greedy] : matches the character : literally / matches the character / literally / matches the character / literally [^"]* match a single character not present in the list below Quantifier: * Between zero and unlimited times, as many times as possible, giving back as needed [greedy] " a single character in the list " literally (case sensitive) ogg matches the characters ogg literally (case sensitive) When we run this ourselves we get the following $ grep --only-matching 'https*://[^"]*ogg' tuxjam.xml https://archive.org/download/tuxjam-121/tuxjam_121.ogg https://archive.org/download/tuxjam-120/TuxJam_120.ogg https://archive.org/download/tux-jam-119/TuxJam_119.ogg https://archive.org/download/tuxjam_118/tuxjam_118.ogg https://archive.org/download/tux-jam-117-uncut/TuxJam_117.ogg https://tuxjam.otherside.network/tuxjam-115-ogg https://archive.org/download/tuxjam_116/tuxjam_116.ogg https://tuxjam.otherside.network/tuxjam-115-ogg https://tuxjam.otherside.network/tuxjam-115-ogg https://tuxjam.otherside.network/tuxjam-115-ogg https://ogg http://tuxjam.otherside.network/wp-content/uploads/sites/5/2024/10/tuxjam_115_OggCamp2024.ogg https://ogg https://archive.org/download/tuxjam_114/tuxjam_114.ogg https://archive.org/download/tuxjam_113/tuxjam_113.ogg https://archive.org/download/tuxjam_112/tuxjam_112.ogg The last command returns the first line, so therefore https://archive.org/download/tuxjam-121/tuxjam_121.ogg Finally that line is used as the input to the wget command. Problems with the approach Relying on grep with structured data like xml or json can lead to problems. When we looked at the output of the command in step 2, some of the results gave https://ogg . When run the same command without the --only-matching argument we see what was matched. $ grep 'https*://[^"]*ogg' tuxjam.xml This episode may not be live as in TuxJam 115 from Oggcamp but your friendly foursome of Al, Dave (thelovebug), Kevie and Andrew (mcnalu) are very much alive to treats of Free and Open Source Software and Creative Commons tunes. https://tuxjam.otherside.network/tuxjam-115-oggcamp-2024/ https://tuxjam.otherside.network/tuxjam-115-oggcamp-2024/#respond https://tuxjam.otherside.network/tuxjam-115-oggcamp-2024/feed/ With the group meeting up together for the first time in person, it was decided that a live recording would be an appropriate venture. With the quartet squashed around a table and a group of adoring fans crowded into a room at the Pendulum Hotel in Manchester, the discussion turns to TuxJam reviews that become regularly used applications, what we enjoyed about OggCamp 2024 and for the third section the gang put their reputation on the line and allow open questions from the sea of dedicated fans. OggCamp 2024 on Saturday 12 and Sunday 13 October 2024, Manchester UK. Two of the hits are not enclosures at all, they are references in the text to OggCamp what we enjoyed about OggCamp 2024 Normally running grep will only get one entry per line, and if the xml is minimised it can miss entries on a file that comes across as one big line. I did this myself using xmllint --noblanks tuxjam.xml > tuxjam-min.xml I then edited it and replaced the new lines with spaces. I have to say that the --only-matching argument is doing a great job at pulling out the matches. That said the results were not perfect either. $ grep --only-matching 'https*://[^"]*ogg' tuxjam-min.xml https://archive.org/download/tuxjam-121/tuxjam_121.ogg https://archive.org/download/tuxjam-120/TuxJam_120.ogg https://archive.org/download/tux-jam-119/TuxJam_119.ogg https://archive.org/download/tuxjam_118/tuxjam_118.ogg https://archive.org/download/tux-jam-117-uncut/TuxJam_117.ogg https://tuxjam.otherside.network/tuxjam-115-ogg https://archive.org/download/tuxjam_116/tuxjam_116.ogg https://tuxjam.otherside.network/tuxjam-115-ogg https://tuxjam.otherside.network/?p=1029https://tuxjam.otherside.network/tuxjam-115-oggcamp-2024/#respondhttps://tuxjam.otherside.network/tuxjam-115-ogg https://ogg http://tuxjam.otherside.network/wp-content/uploads/sites/5/2024/10/tuxjam_115_OggCamp2024.ogg https://ogg https://archive.org/download/tuxjam_114/tuxjam_114.ogg https://archive.org/download/tuxjam_113/tuxjam_113.ogg https://archive.org/download/tuxjam_112/tuxjam_112.ogg You could fix it by modifying the grep arguments and add additional searches looking for enclosure . The problem with that approach is that you'll forever and a day be chasing issues when someone changes something. So the approach is officially "Grand", but it's a very likely to break if you're not babysitting it. Suggested Applications. I recommend never parsing structured documents , like xml or json with grep. You should use dedicated parsers that understands the document markup, and can intelligently address parts of it. I recommend: xml use xmlstarlet json use jq yaml use yq Of course anyone that looks at my code on the hpr gittea will know this is a case of "do what I say, not what I do." Never parse xml with grep, where the only possible exception is to see if a string is in a file in the first place. grep --max-count=1 --files-with-matches That's justified under the fact that grep is going to be faster than having to parse, and build a XML Document Object Model when you don't have to. Some Tips Always refer to examples and specification A specification is just a set of rules that tell you how the document is formatted. There is a danger in just looking at example files, and not reading the specifications. I had a situation once where a software developer raised a bug as the files didn't begin with ken-test- followed by a uuid . They were surprised when the supplied files did not follow this convention as per the examples. Suffice to say that was rejected. For us there are the rules from the RSS specification itself, but as it's a XML file there are XML Specifications . While the RSS spec is short, the XML is not, so people tend to use dedicated libraries to parse XML. Using a dedicated tool like xmlstarlet will allow us to mostly ignore the details of XML. RSS is a dialect of XML . All RSS files must conform to the XML 1.0 specification, as published on the World Wide Web Consortium (W3C) website. The first line of the tuxjam feed shows it's an XML file. The specification goes on to say "At the top level, a RSS document is a element, with a mandatory attribute called version, that specifies the version of RSS that the document conforms to. If it conforms to this specification, the version attribute must be 2.0." And sure enough then the second line show that it's a RSS file. Use the best tool for the job You wouldn't grep a Excel File ? Why would you grep an XML file ? We could go on all day but I want to get across the idea that there is structure in the file. As XML is everywhere you should have a tool to process it. More than likely xmlstarlet is in all the distro repos, so just install it. The help looks like this: $ xmlstarlet --help XMLStarlet Toolkit: Command line utilities for XML Usage: xmlstarlet [] [] where is one of: ed (or edit) - Edit/Update XML document(s) sel (or select) - Select data or query XML document(s) (XPATH, etc) tr (or transform) - Transform XML document(s) using XSLT val (or validate) - Validate XML document(s) (well-formed/DTD/XSD/RelaxNG) fo (or format) - Format XML document(s) el (or elements) - Display element structure of XML document c14n (or canonic) - XML canonicalization ls (or list) - List directory as XML esc (or escape) - Escape special XML characters unesc (or unescape) - Unescape special XML characters pyx (or xmln) - Convert XML into PYX format (based on ESIS - ISO 8879) p2x (or depyx) - Convert PYX into XML are: -q or --quiet - no error output --doc-namespace - extract namespace bindings from input doc (default) --no-doc-namespace - don't extract namespace bindings from input doc --version - show version --help - show help Wherever file name mentioned in command help it is assumed that URL can be used instead as well. Type: xmlstarlet --help for command help XMLStarlet is a command line toolkit to query/edit/check/transform XML documents (for more information see http://xmlstar.sourceforge.net/) You can get more help on a given topic by calling the xmlstarlet command like this: $ xmlstarlet el --help XMLStarlet Toolkit: Display element structure of XML document Usage: xmlstarlet el [] where - input XML document file name (stdin is used if missing) is one of: -a - show attributes as well -v - show attributes and their values -u - print out sorted unique lines -d - print out sorted unique lines up to depth XMLStarlet is a command line toolkit to query/edit/check/transform XML documents (for more information see http://xmlstar.sourceforge.net/) To prove that it's a structured document we can run the command xmlstarlet el -u - show me unique elements $ xmlstarlet el -u tuxjam.xml rss rss/channel rss/channel/atom:link rss/channel/copyright rss/channel/description rss/channel/generator rss/channel/image rss/channel/image/link rss/channel/image/title rss/channel/image/url rss/channel/item rss/channel/item/category rss/channel/item/comments rss/channel/item/content:encoded rss/channel/item/description rss/channel/item/enclosure rss/channel/item/guid rss/channel/item/itunes:author rss/channel/item/itunes:duration rss/channel/item/itunes:episodeType rss/channel/item/itunes:explicit rss/channel/item/itunes:image rss/channel/item/itunes:subtitle rss/channel/item/itunes:summary rss/channel/item/link rss/channel/item/pubDate rss/channel/item/slash:comments rss/channel/item/title rss/channel/item/wfw:commentRss rss/channel/itunes:author rss/channel/itunes:category rss/channel/itunes:explicit rss/channel/itunes:image rss/channel/itunes:owner rss/channel/itunes:owner/itunes:name rss/channel/itunes:subtitle rss/channel/itunes:summary rss/channel/itunes:type rss/channel/language rss/channel/lastBuildDate rss/channel/link rss/channel/podcast:guid rss/channel/podcast:license rss/channel/podcast:location rss/channel/podcast:medium rss/channel/podcast:podping rss/channel/rawvoice:frequency rss/channel/rawvoice:location rss/channel/sy:updateFrequency rss/channel/sy:updatePeriod rss/channel/title That is the xpath representation of the xml structure. It's very similar to a unix filesystem tree. There is one rss branch, of that is one channel branch, and that can have many item branches. "Save the latest file from a feed" The ask here is to "Save the latest file from a feed". The solution Kevie gave gets the "first entry in the feed", which is correct for his feed but is not safe. However let's see how we could replace grep with xmlstarlet . The definition of enclosure is: is an optional sub-element of . It has three required attributes. url says where the enclosure is located, length says how big it is in bytes, and type says what its type is, a standard MIME type. The url must be an http url. The location of the files must be in rss/channel/item/enclosure or it's not a Podcast feed. In each enclosure there has to be a xml attribute called url which points to the media. xmlstarlet has the select command to select locations. $ xmlstarlet sel --help XMLStarlet Toolkit: Select from XML document(s) Usage: xmlstarlet sel {} [ ... ] where - global options for selecting - input XML document file name/uri (stdin is used if missing) - template for querying XML document with following syntax: are: -Q or --quiet - do not write anything to standard output. -C or --comp - display generated XSLT -R or --root - print root element -T or --text - output is text (default is XML) -I or --indent - indent output -D or --xml-decl - do not omit xml declaration line -B or --noblanks - remove insignificant spaces from XML tree -E or --encode - output in the given encoding (utf-8, unicode...) -N = - predefine namespaces (name without 'xmlns:') ex: xsql=urn:oracle-xsql Multiple -N options are allowed. --net - allow fetch DTDs or entities over network --help - display help Syntax for templates: -t|--template where -c or --copy-of - print copy of XPATH expression -v or --value-of - print value of XPATH expression -o or --output - output string literal -n or --nl - print new line -f or --inp-name - print input file name (or URL) -m or --match - match XPATH expression --var --break or --var = - declare a variable (referenced by $name) -i or --if - check condition --elif - check condition if previous conditions failed --else - check if previous conditions failed -e or --elem - print out element -a or --attr - add attribute -b or --break - break nesting -s or --sort op xpath - sort in order (used after -m) where op is X:Y:Z, X is A - for order="ascending" X is D - for order="descending" Y is N - for data-type="numeric" Y is T - for data-type="text" Z is U - for case-order="upper-first" Z is L - for case-order="lower-first" Options we will need are: -T or --text - output is text (default is XML) -t|--template where -m or --match - match XPATH expression -v or --value-of - print value of XPATH expression -n or --nl - print new line So putting it together we will get: $ xmlstarlet sel --text --template --match 'rss/channel/item' --value-of 'enclosure/@url' --nl tuxjam.xml https://archive.org/download/tuxjam-121/tuxjam_121.ogg https://archive.org/download/tuxjam-120/TuxJam_120.ogg https://archive.org/download/tux-jam-119/TuxJam_119.ogg https://archive.org/download/tuxjam_118/tuxjam_118.ogg https://archive.org/download/tux-jam-117-uncut/TuxJam_117.ogg https://archive.org/download/tuxjam_116/tuxjam_116.ogg http://tuxjam.otherside.network/wp-content/uploads/sites/5/2024/10/tuxjam_115_OggCamp2024.ogg https://archive.org/download/tuxjam_114/tuxjam_114.ogg https://archive.org/download/tuxjam_113/tuxjam_113.ogg https://archive.org/download/tuxjam_112/tuxjam_112.ogg We match for all the rss/channel/item and look for any enclosure/@url s, simple enough. We could replace the grep in Kevie's script, wget `curl https://tuxjam.otherside.network/feed/podcast/ | grep -o 'https*://[^"]*ogg' | head -1` with, wget "$( curl --silent https://tuxjam.otherside.network/feed/podcast/ | xmlstarlet sel --text --template --match 'rss/channel/item' --value-of 'enclosure/@url' --nl - | head -1 )" Which would guarantee to give the "first entry in the feed". Some additions is the use of $() instead of back ticks, as it's easier to nest them, and I think it's clearer that something is been executed. I also added --silent to curl to suppress the progress bar. Also replaced the file name with - dash to tell xmlstarlet that the input will be piped from standard in. How about the latest feed ? There is nothing to stop someone producing a RSS feed where the latest entries are at the end, or even sorted alphabetically, or random. They are all valid use cases and are allowed under the Specification. So how would we find the "latest podcast" ?. While defined as optional, the items pubDate found at rss/channel/item/pubDate , is usually also always defined in podcast feeds. is an optional sub-element of . Its value is a date, indicating when the item was published. If it's a date in the future, aggregators may choose to not display the item until that date. Sun, 19 May 2002 15:21:36 GMT Unfortunately they picked a completely stupid email date format , as opposed to a sane format like rfc3339 a subset of iso8601 . So if you want to get the "latest podcast" you need to parse then convert the pubDate to sortable format like iso8601 or Unix epoch . I'll do the first part here, the second is it's own (series) of shows. The Problem with Time & Timezones - Computerphile So could it be as simple as replacing the xpath enclosure/@url of with pubDate ? Yes, yes it is. $ xmlstarlet sel --text --template --match 'rss/channel/item' --value-of 'pubDate' --nl tuxjam.xml Fri, 23 May 2025 17:54:17 +0000 Fri, 28 Feb 2025 15:48:57 +0000 Mon, 03 Feb 2025 09:57:26 +0000 Sat, 21 Dec 2024 17:08:26 +0000 Thu, 05 Dec 2024 12:57:52 +0000 Sat, 30 Nov 2024 20:31:20 +0000 Wed, 30 Oct 2024 08:10:58 +0000 Mon, 26 Aug 2024 15:11:51 +0000 Fri, 05 Jul 2024 18:15:44 +0000 Sat, 08 Jun 2024 09:21:50 +0000 But we will need both the enclosure/@url and pubDate , and we can do this using the concat option. For more information on this see the XmlStarlet Command Line XML Toolkit User's Guide $ xmlstarlet sel --text --template --match 'rss/channel/item' --value-of 'concat(pubDate, ";", enclosure/@url)' --nl tuxjam.xml Fri, 23 May 2025 17:54:17 +0000;https://archive.org/download/tuxjam-121/tuxjam_121.ogg Fri, 28 Feb 2025 15:48:57 +0000;https://archive.org/download/tuxjam-120/TuxJam_120.ogg Mon, 03 Feb 2025 09:57:26 +0000;https://archive.org/download/tux-jam-119/TuxJam_119.ogg Sat, 21 Dec 2024 17:08:26 +0000;https://archive.org/download/tuxjam_118/tuxjam_118.ogg Thu, 05 Dec 2024 12:57:52 +0000;https://archive.org/download/tux-jam-117-uncut/TuxJam_117.ogg Sat, 30 Nov 2024 20:31:20 +0000;https://archive.org/download/tuxjam_116/tuxjam_116.ogg Wed, 30 Oct 2024 08:10:58 +0000;http://tuxjam.otherside.network/wp-content/uploads/sites/5/2024/10/tuxjam_115_OggCamp2024.ogg Mon, 26 Aug 2024 15:11:51 +0000;https://archive.org/download/tuxjam_114/tuxjam_114.ogg Fri, 05 Jul 2024 18:15:44 +0000;https://archive.org/download/tuxjam_113/tuxjam_113.ogg Sat, 08 Jun 2024 09:21:50 +0000;https://archive.org/download/tuxjam_112/tuxjam_112.ogg I use the ; as delimiter. To tackle the date we will need to use the date command with the following options: -d, --date=STRING display time described by STRING, not 'now' -u, --utc, --universal print or set Coordinated Universal Time (UTC) The once it's in a sane format we can use the sort to sort them with the newest on the top. -n, --numeric-sort compare according to string numerical value; see full documentation for supported strings -r, --reverse reverse the result of comparisons Putting that into a script #!/bin/bash # (c) CC-0 Ken Fallon 2025 podcast="https://tuxjam.otherside.network/feed/podcast/" wget --quiet $( curl --silent "${podcast}" | \ xmlstarlet sel --text --template --match 'rss/channel/item' --value-of 'concat(pubDate, ";", enclosure/@url)' --nl - | \ while read item do pubDate="$( echo ${item} | awk -F ';' '{print $1}' )" pubDate="$( \date -d "${pubDate}" --universal +%Y-%m-%dT%H:%M:%S )" url="$( echo ${item} | awk -F ';' '{print $2}' )" echo -e "${pubDate}\t${url}" done | \ sort --numeric-sort --reverse | \ head -1 | \ awk '{print $NF}' ) Admittedly it's a smidgen linger than Kevies in it's one liner format. wget "$( curl --silent "https://tuxjam.otherside.network/feed/podcast/" | xmlstarlet sel --text --template --match 'rss/channel/item' --value-of 'concat(pubDate, ";", enclosure/@url)' --nl - | while read item; do pubDate="$( echo ${item} | awk -F ';' '{print $1}' )"; pubDate="$( \date -d "${pubDate}" --universal +%Y-%m-%dT%H:%M:%S )"; url="$( echo ${item} | awk -F ';' '{print $2}' )"; echo -e "${pubDate}\t${url}"; done | sort --numeric-sort --reverse | head -1 | awk '{print $NF}' )" Provide feedback on this episode .…

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HPR4403: How to get your very own copy of the HPR database

3 дні тому

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This show has been flagged as Clean by the host. Get your own copy of the HPR database reset_hpr.sh systemctl start mariadb curl https://hackerpublicradio.org/hpr.sql > hpr.sql mariadb -e 'drop database hpr_hpr' mariadb -e 'create database hpr_hpr' mariadb hpr_hpr < hpr.sql mariadb -e 'select count(*) from eps' hpr_hpr mariadb -e 'select * from comments where comment_author_name="Torin Doyle" \G' hpr_hpr Provide feedback on this episode .…

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HPR4402: pinetab2

4 дні тому

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This show has been flagged as Clean by the host. 1 intro hpr 4346 swift 110 2 prior tablet samsung tablet lineageos 3 my use case reading pdfs/epubs using emacs forth developement on microcontrollers, serial port access was a challenge 4 my not use case video media consumption audio consumption 5 pinetab2 tablet based on rockchip rk3566 4 gig and 8 gig models community driven developement 6 impressions kids love rolling releases and glitzy desktops this device needs minimum everything to be useful stuck with arch stuck with systemd wayland 7 so what i did installed x11, better, mature system, virtual keyboards installed fluxbox, low system resources needed. lots of customization done by config files, yes suckless is no good installed emacs-lucid (gtk no good), why you ask? emacs is a lisp environment focused on text editing emacs has mechanisms that allow intereaction with X easy to build functions to get basic tablet motions epub modes, pdf modes, terminal emulator , org mode! installed xvkbd for virtual keyboard in tablet mode installed xpdf all programs in factory arch install available 8 where this is at functions ok laptop mode is nice, keyboard case works well tablet rotation is done via emacs commands (need to bind these to keys) and has three modes tablet mode with virtual keyboard tablet mode with external key board (full screen portrait mode) tablet mode using keyboard case, book mode still suffer random crashes, still tracking that down good battery life (battery status available on emacs modeline) wifi works, bluetooth doesn't easy access to serial ports using standard tools 9 what i'd like to do install slackware spify up the desktop add functionality things like brightness control Provide feedback on this episode .…

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HPR4401: hajime

5 днів тому

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This show has been flagged as Explicit by the host. hajime This installation script installs an Arch Linux system on an x64 architecture. The installation can be done with or without a network connection (internet). oxo/hajime - Codeberg.org hajime/make-recov at main - oxo/hajime - Codeberg.org isolatest/isolatest at main - oxo/isolatest - Codeberg.org Provide feedback on this episode .…

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HPR4400: Isaac Asimov: Other Asimov Novels of Interest

8 днів тому

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This show has been flagged as Clean by the host. Isaac Asimov is best known for two series, the Foundation series and the Robot series, and he eventually tied them together. But he also wrote some stand-alone novels that are quite good, and I want to discuss them here. They are The End Of Eternity, The Gods Themselves, and Nemesis. Links: https://en.wikipedia.org/wiki/The_End_of_Eternity https://en.wikipedia.org/wiki/The_Gods_Themselves https://en.wikipedia.org/wiki/Nemesis_(Asimov_novel) https://www.palain.com/science-fiction/the-golden-age/other-asimov-novels-of-interest/ Provide feedback on this episode .…

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HPR4399: gpg-gen-key

9 днів тому

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This show has been flagged as Explicit by the host. More than ten years ago I studied the lecture recordings of "Introduction to Cryptography" Introduction to Cryptography by Christof Paar - Invidious by Professor Paar Christof Paar - Wikipedia , which are absolutely amazing! These lectures will learn you how the most popular encryption algorithms work. The scripts I mentioned in their current versions are: tool/gpg-gen-key at main - oxo/tool - Codeberg.org tool/gpg-bu-key at main - oxo/tool - Codeberg.org tool/gpg-pass-vfy at main - oxo/tool - Codeberg.org Search the history for commit 95408d31c2 (gpg-gen-key) and dd608f9bd6 (gpg-bukey and gpg-pass-vfy) for the versions at the moment of recording. Provide feedback on this episode .…

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HPR4398: Command line fun: downloading a podcast

10 днів тому

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This show has been flagged as Clean by the host. Kevie, from the TuxJam podcast, continues his look at audio tools on the command line; this time focusing on acquiring audio files from an RSS feed. Save the latest file from a feed: wget `curl RSS_FEED | grep -o 'https*://[^"]*FILE_EXTENSION' | head -1` To get the latest episode of TuxJam wget `curl https://tuxjam.otherside.network/feed/podcast/ | grep -o 'https*://[^"]*ogg' | head -1` However if you want the files from the whole feed: wget `curl RSS_FEED | grep -Eo 'https*://[^"]*FILE_EXTENSION' | sort -u | xargs` To get every episode of TuxJam: wget `curl https://tuxjam.otherside.network/feed/podcast/ | grep -Eo 'https*://[^"]*ogg' | sort -u | xargs` If you wish to specify the directory to save the file in then use -P /directory after wget. To download the TuxJam feed and place the files in a directory called Podcasts in your home folder you would use: wget -P ~/Podcasts `curl https://tuxjam.otherside.network/feed/podcast/ | grep -Eo 'https*://[^"]*ogg' | sort -u | xargs` For more in this mini-series of audio command line tools then see: hpr4249 :: Audio Streams on the Command Line hpr4287 :: Schedule audio recordings on the command line hpr4294 :: Schedule audio recordings on the command line - A bit of fine tuning Provide feedback on this episode .…

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HPR4397: Transfer files from desktop to phone with qrcp

11 днів тому

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This show has been flagged as Clean by the host. How does it work? qrcp binds a web server to the address of your Wi-Fi network interface on a random port and creates a handler for it. The default handler serves the content and exits the program when the transfer is complete. When used to receive files, qrcp serves an upload page and handles the transfer. The tool prints a QR code that encodes the text: http://{address}:{port}/{random_path} Most QR apps can detect URLs in decoded text and act accordingly (i.e. open the decoded URL with the default browser), so when the QR code is scanned the content will begin downloading by the mobile browser. (Notes taken from https://github.com/claudiodangelis/qrcp released under the MIT license . Links https://github.com/claudiodangelis/qrcp/releases https://qrcp.sh/tutorials/secure-transfers-with-mkcert Provide feedback on this episode .…

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HPR4396: AI and Sangria

12 днів тому

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This show has been flagged as Explicit by the host. We join operat0r in the kitchen for another cooking and AI discussion. Chock full of tasty tips of getting your LLM of choice up and running. Links https://en.wikipedia.org/wiki/Sangria https://www.anaconda.com/docs/getting-started/miniconda/install https://duckduckgo.com/?t=ffab&q=silly%20tagern%20install&ia=web https://docs.unsloth.ai/ https://en.wikipedia.org/wiki/Windows_Subsystem_for_Linux https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html https://pytorch.org/get-started/locally/ Provide feedback on this episode .…

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HPR4395: Second Life

15 днів тому

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Second Life is a multiplayer virtual world that allows people to create an avatar for themselves and then interact with other users and user-created content within a multi-user online environment. From Wikipedia, the free encyclopedia Links Second Life Official Website - https://secondlife.com/ Second Life on Wikipedia - https://en.wikipedia.org/wiki/Second_Life Linden Lab - https://lindenlab.com/…

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HPR4394: Digital Steganography Intro

16 днів тому

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Apologies for not introducing myself in the audio! I struggled a bit to take on this topic at a high enough level to keep it to about a half hour, because every subtopic is nuanced and the details are always technical. Not sure how well it worked out but my intention was to focus mainly on the 2 most common examples - hiding messages in text and in images. Topics I mentioned: encryption vs steganography who uses steganography and for what purpose? hiding text in text hiding data in images using LSB encoding hiding data in other places steganalysis If you want to leave feedback, consider saying whether you think it would be more useful to talk about: using the most popular tools and software detailed look at specific steganographic techniques case studies in the unlikely case that I do a followup episode (I doubt there's a strong interest in this topic)…

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HPR4393: Journal like you mean it.

17 днів тому

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Prerequisites: Novice Ability to read and write. Access to pen and paper. Advanced/Expert Disc bound notebook (if you're cool you'll have one) Title: BIC Soft Feel Retractable Ballpoint Pen, Medium Point (1.0mm) Source(s): https://us.bic.com/en_us/bic-soft-feel-retractable-ball-point-pen-medium-assorted-36-pack.html UPC: 070330196506 Item Number: SCSM361-AST Commercial name: Soft Feel Retractable Ball Pen Retractable pen no-slip grip Tungsten carbide ball 1.0mm medium point Title: BIC Cristal Xtra Smooth Black Ballpoint Pens, Medium Point (1.0mm). Source(s): https://us.bic.com/en_us/bic-cristal-xtra-smooth-black-ballpoint-pens-medium-point-1-0mm-500-count-pack.html UPC: 070330377226 Item Number: MS500E-BLK Commercial name: Cristal Xtra Smooth Ball Pen Cap with pocket clip Tungsten carbide ball 1.0mm medium point Translucent barrel for visible ink supply Title: BIC Round Stic Xtra Comfort Black Ballpoint Pens, Medium Point (1.0mm). Source(s): https://us.bic.com/en_us/bic-round-stic-xtra-comfort-black-ballpoint-pens-144-count-pack.html UPC: 070330377325 Item Number: GSMG144E-BLK Commercial name: Round Stic Grip Xtra Comfort Ball Pen Cap with pocket clip Tungsten carbide ball 1.0mm medium point Title: BIC Round Stic Xtra Life, Ball Point Pen Source(s): https://us.bic.com/en_us/bic-round-stic-xtra-life-ball-point-pen-blue-60-pack.html Cap with pocket clip Tungsten carbide ball 1.0mm medium point Translucent barrel for visible ink supply UPC: 070330131613 Item Number: GSM609DC Commercial name: Round Stic Xtra Life Ball Pen Title: Pilot G2 Pens 0.7 mm Source(s): https://www.target.com/s/pilot+g2+pens Source(s): https://pilotpen.us/Product?0=41&1=47&cid=260 Gel ink Rolling Ball 0.7mm fine point Translucent barrel for visible ink supply Rubber grip Refillable Convenient clip Title: Uniball Signo 207 Source(s): https://www.unibrands.co/collections/207 Gel ink 0.7mm fine point Translucent barrel for visible ink supply Rubber grip Refillable Convenient clip Title: uniball™ Roller, Rollerball Pens. Source(s): https://www.unibrands.co/collections/rollerball-pens/products/roller-rollerball-pens Gel ink 0.7mm fine point Refillable Cap with clip Title: 8.5 x 11 dot g…

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HPR4392: The Water is Wide, and the sheet music should be too

18 днів тому

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lilypond opensource music notation software https://lilypond.org/ dombra https://en.wikipedia.org/wiki/Dombra

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HPR4391: HPR Community News for May 2025

19 днів тому