RogerBW's Blog

Perl Weekly Challenge 135: Valid Middle 21 October 2021

I’ve been doing the Weekly Challenges. The latest involved digit substrings and securities validation. (Note that this is open until 24 October 2021.)

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Interfacing with rtorrent over Unix sockets 20 October 2021

The torrent client rtorrent is the best I've found that runs on Unix systems, but its built-in logic is somewhat lacking. Fortunately one can extend this.

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Perl Weekly Challenge 134: Pandigital Multiplication 13 October 2021

I’ve been doing the Weekly Challenges. The latest involved pandigital numbers and multiplication tables. (Note that this is open until 17 October 2021.)

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Perl Weekly Challenge 133: Rooting the Smith 06 October 2021

I’ve been doing the Weekly Challenges. The latest involved Smith numbers and square roots. (Note that this is open until 10 October 2021.)

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Perl Weekly Challenge 132: Hash on the Mirror 02 October 2021

I’ve been doing the Weekly Challenges. The latest involved date calculations and inner joins. (Note that this is open until 3 October 2021.)

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Perl Weekly Challenge 131: Splitting and Splitting More 23 September 2021

I’ve been doing the Weekly Challenges. The latest involved splitting arrays and strings. (Note that this is open until 26 September 2021.)

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Perl Weekly Challenge 130: An Odd Tree 17 September 2021

I’ve been doing the Weekly Challenges. The latest involved more binary trees and linked lists. (Note that this is open until 19 September 2021.)

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Perl Weekly Challenge 129: Eats Roots and Lists 10 September 2021

I’ve been doing the Weekly Challenges. The latest involved more binary trees and linked lists. (Note that this is open until 12 September 2021.)

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Perl Weekly Challenge 128: Maxima and Minima 03 September 2021

I’ve been doing the Weekly Challenges. The latest involved finding submatrices and counting trains. (Note that this is open until 5 September 2021.)

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Perl Weekly Challenge 127: Disjoint Conflict 26 August 2021

I’ve been doing the Weekly Challenges. The latest involved set intersections and merging intervals. (Note that this is open until 29 August 2021.)

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Perl Weekly Challenge 126: Count Sweeper 20 August 2021

I’ve been doing the Weekly Challenges. The latest involved numbers excluding 1, and Minesweeper. (Note that this is open until 22 August 2021.)

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Perl Weekly Challenge 125: Pythagorean Diameter 11 August 2021 - 1 comment

I’ve been doing the Weekly Challenges. The latest involved Pythagorean triples and binary trees. (Note that this is open until 15 August 2021.)

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Perl Weekly Challenge 124: War Day 04 August 2021 - 4 comments

I’ve been doing the Weekly Challenges. The latest involved ASCII graphics and set partitioning. (Note that this is open until 8 August 2021.)

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Perl Weekly Challenge 123: Ugly Square 28 July 2021 - 3 comments

I’ve been doing the Weekly Challenges. The latest involved regular numbers and geometrical squareness testing. (Note that this is open until 1 August 2021.)

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Perl Weekly Challenge 122: Basketball Stream 22 July 2021 - 1 comment

I’ve been doing the Weekly Challenges. The latest involved a progressive average and additive compositions. (Note that this is open until 25 July 2021.)

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Perl Weekly Challenge 121: Travelling Bit 14 July 2021 - 6 comments

I’ve been doing the Weekly Challenges. The latest involved more binary manipulation and a traditional problem. (Note that this is open until 18 July 2021.)

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Perl Weekly Challenge 120: Swap Clock 07 July 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved more binary manipulation and analogue clocks. (Note that this is open until 11 July 2021.)

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Perl Weekly Challenge 119: Sequence Nibble 02 July 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved fake binary manipulation and an unusual number sequence. (Note that this is open until 4 July 2021.)

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Perl Weekly Challenge 118: Binary Knight 23 June 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved binary palindromes and a restricted Knight's Tour. (Note that this is open until 27 June 2021.)

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Perl Weekly Challenge 117: Missing Possibilities 16 June 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved file analysis and combinatorial explosion. (Note that this is open until 20 June 2021.)

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Perl Weekly Challenge 116: Square Sequence 10 June 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved lots of digit splitting. (Note that this is open until 13 June 2021.)

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Perl Weekly Challenge 115: Largest Chain 05 June 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved chained strings and number construction. (Note that this is open until 6 June 2021.)

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Perl Weekly Challenge 114: Going Higher 27 May 2021 - 2 comments

I’ve been doing the Perl Weekly Challenges. The latest involved unconventional solutions to numerical problems. (Note that this is open until 30 May 2021.)

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Perl Weekly Challenge 113: Represent-Recreate 19 May 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved finding constrained integer decompositions and more binary tree furkling. (Note that this is open until 23 May 2021.)

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Perl Weekly Challenge 112: Canonical Stairs 12 May 2021 - 2 comments

I’ve been doing the Perl Weekly Challenges. The latest involved path canonicalisation and numerical compositions. (Note that this is open until 16 May 2021.)

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Perl Weekly Challenge 111: Search Letters 05 May 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved search optimisations and word sorting. (Note that this is open until 9 May 2021.)

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Perl Weekly Challenge 110: Transpose Numbers 28 April 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved transpositions. (Note that this is open until 2 May 2021.)

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Podcast Recording in Isolation 22 April 2021

Now that I'm involved in a boardgaming podcast as well as the role-playing one, and all recording is remote, I've been recording multiple tracks and editing them together.

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Perl Weekly Challenge 109: Chowla Squares 20 April 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved another numerical sequence and permutations. (Note that this is open until 25 April 2021.)

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Perl Weekly Challenge 108: Memory Bell 13 April 2021 - 3 comments

I’ve been doing the Perl Weekly Challenges. The latest involved bad things and triangular numbers. (Note that this is open until 18 April 2021.)

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Perl Weekly Challenge 107: Self-Descriptive Methods 07 April 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved several sorts of introspection. (Note that this is open until 11 April 2021.)

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Perl Weekly Challenge 106: Maximum Decimal 31 March 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved integer differences and decimal expansion. (Note that this is open until 4 April 2021.)

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Perl Weekly Challenge 105: Name Root 23 March 2021 - 2 comments

I’ve been doing the Perl Weekly Challenges. The latest involved fractional exponentiation and sweating with the oldies. (Note that this is open until 28 March 2021.)

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Perl Weekly Challenge 104: FUSC NIM 16 March 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved the Stern-Brocot sequence (which Dijkstra named "fusc") and a variant of Nim. (Note that this is open until 21 March 2021.)

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Getting your podcast onto iTunes and Spotify 12 March 2021 - 2 comments

One of the podcasts I work on has been on iTunes for a while, which was done back when it was easier. Now the other two are as well, and they're all on Spotify too. Here's how to achieve this, from a standing start.

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Perl Weekly Challenge 103: Playing Zodiac 10 March 2021

I’ve been doing the Perl Weekly Challenges. The latest involved lots of modulus arithmetic. (Note that this is open until 14 March 2021.)

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Migrating a Discourse server 09 March 2021

I recently moved discussion.tekeli.li to a new host. Here's how I did it (with the false starts removed).

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Perl Weekly Challenge 102: Rare Hash 03 March 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved an obscure class of number and a self-consistent string format. (Note that this is open until 7 March 2021.)

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Perl Weekly Challenge 101: Spiral Origin 24 February 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved packing an array and a standard geometry problem. (Note that this is open until 28 February 2021.)

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Flamme Rouge by Forum 21 February 2021 - 2 comments

I have written and released software for running games of Flamme Rouge by forum.

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Perl Weekly Challenge 100: Time Triangle 18 February 2021

I’ve been doing the Perl Weekly Challenges. The latest involved converting time formats and more tree traversal. (Note that this is open until 21 February 2021.)

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Perl Weekly Challenge 99: Unique Match 10 February 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved globbing and building sub-sequences. (Note that this is open until 14 February 2021.)

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Perl Weekly Challenge 98: Insert N 05 February 2021

I’ve been doing the Perl Weekly Challenges. The latest involved reading tiny chunks from a file and searching a list. (Note that this is open until 7 February 2021.)

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Perl Weekly Challenge 97: Caesar Substrings 27 January 2021

I’ve been doing the Perl Weekly Challenges. The latest involved implementing the Caesar cipher and breaking up binary strings. (Note that this is open until 31 January 2021.)

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Perl Weekly Challenge 96: Reverse Distance 22 January 2021

I’ve been doing the Perl Weekly Challenges. The latest involved reversing words in a string and calculating Levenshtein distance. (Note that this is open until 24 January 2021.)

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Running a Vote 16 January 2021

I recently ran the vote for the Pearple's Choice Awards, which used to happen on the old Shut Up & Sit Down forum and now happen on discussion.tekeli.li.

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Perl Weekly Challenge 95: Palindrome Stack 14 January 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved testing for palindromic numbers and building a stack class. (Note that this is open until 17 January 2021.)

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Fun with Letter Tycoon 13 January 2021 - 1 comment

I've been playing a lot of Letter Tycoon on BoardGameArena (it seems that losing at Scrabble to my wife is good training for this). I wanted a practice opponent. So I wrote one.

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Advent of Code 2020 07 January 2021

I did Advent of Code again, and had a good time. Spoilers.

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Perl Weekly Challenge 94: Binary Anagrams 05 January 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved grouping anagrams and more furkling with binary trees. (Note that this is open until 10 January 2021.)

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Perl Weekly Challenge 93: Max Path 30 December 2020

I’ve been doing the Perl Weekly Challenges. The latest involved colinear points and binary tree sums. (Note that this is open until 3 January 2021.)

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Perl Weekly Challenge 92: Isomorphic Interval 25 December 2020

I’ve been doing the Perl Weekly Challenges. The latest involved string isomorphism and interval merging. (Note that this is open until 27 December 2020.)

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Perl Weekly Challenge 91: Number Jump 18 December 2020

I’ve been doing the Perl Weekly Challenges. The latest involved breaking down numbers and following sequences. (Note that this is open until 20 December 2020.)

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Perl Weekly Challenge 90: Ethiopian DNA 10 December 2020 - 3 comments

I’ve been doing the Perl Weekly Challenges. The latest involved base sequences and a binary multiplication system. (Note that this is open until 13 December 2020.)

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Perl Weekly Challenge 89: magic sum 05 December 2020

I’ve been doing the Perl Weekly Challenges. The latest involved GCDs and magic squares. (Note that this is open until 6 December 2020.)

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Perl Weekly Challenge 88: Spiral Product 28 November 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved multiplications and spirals. (Note that this is open until 29 November 2020.)

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A Shebang For Rust 23 November 2020

Rust is a compiled language. How can I run a program directly from the shell?

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Perl Weekly Challenge 87: Consecutive Rectangles 19 November 2020

I’ve been doing the Perl Weekly Challenges. The latest involved list searches and matrices. (Note that this is open until 22 November 2020.)

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Perl Weekly Challenge 86: Sudoku Difference 12 November 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved list searches and combinatorial explosions. (Note that this is open until 15 November 2020.)

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Perl Weekly Challenge 85: Triplet Power 05 November 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved searching combinations and integer powers. (Note that this is open until 8 November 2020.)

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Perl Weekly Challenge 84: Reverse squares 28 October 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved reversing integers and a two-dimensional search. (Note that this is open until 1 November 2020.)

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Perl Weekly Challenge 83: Length and Inversion 23 October 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved string manipulation and a numerical search. (Note that this is open until 25 October 2020.)

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A test harness for my Discourse plugin 19 October 2020

I have ended up maintaining a plugin for Discourse. As I got it, it had no tests. Fixing that was fun.

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Perl Weekly Challenge 82: Interleave Factors 14 October 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved common factors and string searches. (Note that this is open until 12 October 2020.)

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A tour of the United Kingdom with Flightgear 12 October 2020

I've now done a Flightgear-simulated tour at "every" airport in the United Kingdom.

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Perl Weekly Challenge 81: Base Frequency 07 October 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved substrings and word frequencies. (Note that this is open until 11 October 2020.)

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Perl Weekly Challenge 80: missing numbers and jealous neighbours 29 September 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved missing numbers and more ranking of neighbours. (Note that this is open until 4 October 2020.)

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Perl Weekly Challenge 79: cumulative bit count and water capacity 23 September 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved more bit counts and an innovative use of histograms.

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Perl Weekly Challenge 78: Leaders and Rotation 16 September 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved searching array values and rotating lists.

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zpool birthday 14 September 2020

On 14 September 2015 I created the storage zpool that I'm still using.

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Perl Weekly Challenge 77: Fibonacci Sum and Lonely X 09 September 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved summing Fibonacci numbers and looking through a grid for neighbours.

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Fun with Flightgear 07 September 2020

I've been playing with Flightgear again, now with a decent joystick and rudder pedals.

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Perl Weekly Challenge 76: prime sum and word search 03 September 2020 - 5 comments

I’ve been doing the Perl Weekly Challenges. The latest involved summing primes and performing a word search.

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Perl Weekly Challenge 75: coins and rectangles 27 August 2020 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved building set values of coins and finding rectangles in histograms.

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Perl Weekly Challenge 74: more songs about lists 23 August 2020

I’ve been doing the Perl Weekly Challenges. The latest involved finding minima in subsets of lists.

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A shim between Flightgear and Viking 20 August 2020

I've been renewing my interest in the Flightgear flight simulator. And it turns out there's a neat trick you can do with it.

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Perl Weekly Challenge 73: fun with minima 15 August 2020 - 2 comments

I’ve been doing the Perl Weekly Challenges. The latest involved finding minima in subsets of lists.

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Perl Weekly Challenge 72: factorial zeroes and line ranges 05 August 2020

I’ve been doing the Perl Weekly Challenges. The latest involved finding the trailing zeroes of a factorial and printing a range of lines from a file.

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Perl Weekly Challenge 71: peak elements (and Rallyman tracks) 28 July 2020

I’ve been doing the Perl Weekly Challenges. The latest involved finding peak elements and more mucking about with linked lists.

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Perl Weekly Challenge 70: character swaps and Gray code 22 July 2020

I’ve been doing the Perl Weekly Challenges. The latest involved swapping characters, and generating Gray code.

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Perl Weekly Challenge 69: invertible numbers and very long strings 18 July 2020

I’ve been doing the Perl Weekly Challenges. The latest involved finding numbers that looked the same inverted, and generating a very long string.

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Perl Weekly Challenge 68: zero matrix and list reordering 10 July 2020

I’ve been doing the Perl Weekly Challenges. The latest involved zeroing parts of a matrix and reordering a list.

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Perl Weekly Challenge 67: combining numbers and phone keypad 03 July 2020

I’ve been doing the Perl Weekly Challenges. The latest involved generating combinations of numbers and expanding telephone keypad letters.

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Perl Weekly Challenge 66: dividing and factorising 29 June 2020 - 2 comments

I’ve been doing the Perl Weekly Challenges. The latest involved dividing without dividing, and making a test of factors.

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Perl Weekly Challenge 65: summing digits and finding palindromes 23 June 2020

I’ve been doing the Perl Weekly Challenges. The latest involved generating large numbers and splitting strings into palindromes.

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Apps that have lasted 16 June 2020 - 5 comments

A friend is experimenting with LineageOS, and it's about two years since I started to use it, so I thought I'd review the apps that I'm still running frequently.

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Perl Weekly Challenge 64: summing paths and breaking words 10 June 2020

I’ve been doing the Perl Weekly Challenges. The latest involved searching for paths through a grid and breaking a word into tokens.

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Perl Weekly Challenge 63: last words and string rotation 06 June 2020

I’ve been doing the Perl Weekly Challenges. The latest involved finding the last matching word in a string and permuting a string.

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SSL certificates! How do they work? 02 June 2020 - 1 comment

An SSL certificate expired.

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Perl Weekly Challenge 62: email sorting and 3d queens 27 May 2020

I’ve been doing the Perl Weekly Challenges. The latest involved sorting email addresses and solving a variant N-queens problem.

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Perl Weekly Challenge 61: maximum products and IPv4 20 May 2020

I’ve been doing the Perl Weekly Challenges. The latest involved searching for the maximum product in a sequence, and un-munging IPv4 addresses.

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Perl Weekly Challenge 60: Excel columns and number generation 14 May 2020 - 2 comments

I’ve been doing the Perl Weekly Challenges. The latest involved working with a form of numeric encoding, and a very arbitrary numerical problem.

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Perl Weekly Challenge 59: linked list and bit sum 12 May 2020 - 2 comments

I’ve been doing the Perl Weekly Challenges. The latest involved working with a linked list and determining binary differences.

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Perl Weekly Challenge 58: version comparison and ordered line 08 May 2020

I’ve been doing the Perl Weekly Challenges. The latest involved comparing version numbers and generating an arbitrary order.

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Arking Time 06 May 2020 - 2 comments

I've been running a small Discourse forum for role-playing and boardgaming for a while now, ever since UKRolePlayers shut down. It's suddenly got much bigger.

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Perl Weekly Challenge 57: tree inversion and unique prefixes 05 May 2020

I’ve been doing the Perl Weekly Challenges. The latest involved inverting a binary tree and finding unique prefixes.

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Perl Weekly Challenge 56: Diff-K and path sum 29 April 2020

I’ve been doing the Perl Weekly Challenges. The latest involved searching arrays and summing tree paths.

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Perl Weekly Challenge 55: binary flips and alternating permutation 25 April 2020

I’ve been doing the Perl Weekly Challenges. The latest involved flipping bits and generating zigzag permutations.

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Perl Weekly Challenge 54: permutations and Collatz 21 April 2020

I’ve been doing the Perl Weekly Challenges. The latest involved generating permutations and checking the Collatz Conjecture.

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Perl Weekly Challenge 53: matrix rotation and string expansion 17 April 2020

I’ve been doing the Perl Weekly Challenges. The latest involved a basic Markov chain.

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Perl Weekly Challenge 52: stepping numbers and game theory 13 April 2020

I’ve been doing the Perl Weekly Challenges. The latest involved some game theory.

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Perl Weekly Challenge 51: triplet sums and colourful numbers 07 April 2020

I’ve been doing the Perl Weekly Challenges. The latest involved a lot of nested loops.

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How To Jitsi 03 April 2020

I've been playing RPGs over Google Hangouts for a while but I don't like it. Here's how to do it with free software instead.

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Perl Weekly Challenge 50: merged intervals and noble integers 30 March 2020

I’ve been doing the Perl Weekly Challenges. The latest was about merging intervals and determining noble numbers.

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Perl Weekly Challenge 49: multiples and LRU cache 22 March 2020

I’ve been doing the Perl Weekly Challenges. The latest was about searching for particular multiples of a number, and implementing a fixed-size cache.

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How To Hangouts 20 March 2020 - 3 comments

I've been playing RPGs over Google Hangouts for a while, and recently several people have asked how to go about this as their regular groups move on-line. So here are my notes.

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Perl Weekly Challenge 48: survivor and palindromic dates 16 March 2020

I’ve been doing the Perl Weekly Challenges. The latest was about calculating the survivor of a stabbing game, and determining palindromic dates.

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Perl Weekly Challenge 47: roman calculator and gapful numbers 09 March 2020

I’ve been doing the Perl Weekly Challenges. The latest was about doing Roman arithmetic and generating gapful numbers.

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Perl Weekly Challenge 46: corrupt messages and hotel rooms 28 February 2020

I’ve been doing the Perl Weekly Challenges. The latest was about recovering a corrupted message and solving an iterative problem.

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Perl Weekly Challenge 45: bad codes and quines 21 February 2020

I’ve been doing the Perl Weekly Challenges. The latest was about a bad encoding scheme and producing the source of a program.

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Perl Weekly Challenge 44: goal-seeking 13 February 2020

I’ve been doing the Perl Weekly Challenges. The latest was about arranging numbers and arithmetical operations.

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Perl Weekly Challenge 43: rings and self-descriptive numbers 09 February 2020

I’ve been doing the Perl Weekly Challenges. The latest was about allocating numbers to rings and generating self-descriptive numbers.

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Perl Weekly Challenge 42: octal and balancing brackets 03 February 2020

I’ve been doing the Perl Weekly Challenges. The latest was about printing in octal and detecting balanced brackets.

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Perl Weekly Challenge 41: obscure number sequences 23 January 2020

I’ve been doing the Perl Weekly Challenges. The latest was about generating number sequences.

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mpd and YouTube 15 January 2020

I've extended my mpd-tools suite to allow for a new mode of operation.

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Advent of Code 2019 09 January 2020

I did last year's Advent of Code, and had a lot of fun working on it. Spoilers.

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Perl Weekly Challenge 40: mucking about with lists 29 December 2019 - 2 comments

I’ve been doing the Perl Weekly Challenges. The latest was about list manipulation.

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Perl Weekly Challenge 39: text parsing 25 December 2019

I’ve been doing the Perl Weekly Challenges. Last week's was about parsing a specific file format.

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Perl Weekly Challenge 38: date parsing and word games 18 December 2019

I’ve been doing the Perl Weekly Challenges. Last week's was about parsing an odd date format and generating words in a Scrabble-ish manner.

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Perl Weekly Challenge 37: weekdays and day lengths 11 December 2019

I’ve been doing the Perl Weekly Challenges. Last week's was about counting weekdays and working out total daylight.

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Perl Weekly Challenge 36: VINs and Knapsacks 05 December 2019

I’ve been doing the Perl Weekly Challenges. Last week's was about validating VINs and solving the knapsack problem.

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Perl Weekly Challenge 35: Binary Morse Code 28 November 2019

I’ve been doing the Perl Weekly Challenges. Last week's was about encoding and decoding to a binary representation of Morse code.

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Perl Weekly Challenge 34 18 November 2019

I’ve been doing the Perl Weekly Challenges Last week’s was about demonstrating specific coding techniques.

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Perl Weekly Challenge 33 08 November 2019

I’ve been doing the Perl Weekly Challenges This week’s was about counting letters and generating a multiplication table.

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Perl Weekly Challenge 32 04 November 2019

I’ve been doing the Perl Weekly Challenges (I missed 31 because of getting ready for Essen, and didn’t have time to do this one in Perl6). This week’s was about counting entities and generating ASCII bar charts.

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Perl Weekly Challenge 30 15 October 2019

I've been doing the Perl Weekly Challenges. This one dealt with date calculations and exhaustive number searches.

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Perl Weekly Challenge 29 11 October 2019

I've been doing the Perl Weekly Challenges. This one dealt with expanding braces and calling C functions.

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Perl Weekly Challenge 28 04 October 2019

I've been doing the Perl Weekly Challenges. This one dealt with testing file contents and producing the current time.

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Perl Weekly Challenge 27 26 September 2019

I've been doing the Perl Weekly Challenges. This one dealt with finding the intersection of two lines and doing worrying things to innocent variables.

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Perl Weekly Challenge 26 20 September 2019

I've been doing the Perl Weekly Challenges. This one dealt with finding letters in words and the mean of circular quantities.

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Perl Weekly Challenge 25 11 September 2019

I've been doing the Perl Weekly Challenges. This one dealt with building long strings and the Chaocypher.

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Perl Weekly Challenge 24 03 September 2019

I've been doing the Perl Weekly Challenges. This one dealt with minimal programs and inverted-index text search.

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Perl Weekly Challenge 23 28 August 2019

I've been doing the Perl Weekly Challenges. This one dealt with difference series and prime factorisation.

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Perl Weekly Challenge 22 24 August 2019

I've been doing the Perl Weekly Challenges. This one dealt with sexy primes and LZW encoding.

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Perl Weekly Challenge 21 15 August 2019

I've been doing the Perl Weekly Challenges. This one dealt with e, and URLs again.

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Perl Weekly Challenge 20 08 August 2019

I've been doing the Perl Weekly Challenges. This one dealt with string splitting and amicable numbers.

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Perl Weekly Challenge 19 05 August 2019 - 2 comments

I've been doing the Perl Weekly Challenges. This one dealt with months and word-wrapping.

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Perl Weekly Challenge 18 27 July 2019

I've been doing the Perl Weekly Challenges. This one was a couple of standard computer-science problems.

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Perl Weekly Challenge 17 24 July 2019

I've been doing the Perl Weekly Challenges. This one was to implement the Ackermann function and parse URLs.

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Xandikos Calendar Server on Debian 10 20 July 2019 - 2 comments

Why have a calendar server in the first place? Because I want to check my schedule from multiple devices, and because I don't want to sell out to Google. (Which of course just means that when Google takes over I won't have been paid.)

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Perl Weekly Challenge 16 18 July 2019

I've been doing the Perl Weekly Challenges. This one was to do a fiddly numerical calculation, and to check Bitcoin addresses.

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Perl Weekly Challenge 15 11 July 2019

I've recently started doing the Perl Weekly Challenges. This one was to hunt primes and do "Vigenère" enciphering.

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Walk Planning with Viking 19 June 2019

Viking is a powerful, but not always intuitive, program for handling geodata (position log recordings, maps, etc.). This post deals with how to plan a walking route using it.

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Moving filenames to UTF-8 11 May 2019 - 1 comment

I've been renaming my large music collection into UTF-8.

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Music for Barbecues 03 May 2019

I've been improving the ways people can get access to the local music server during my barbecues and similar events.

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Unlocking a Pocophone F1 16 April 2019 - 5 comments

My Nexus 6P is jolly good, but its battery has become increasingly unreliable. So I now have a new shinyphone – also running LineageOS. This post covers all the gory details of getting it set up.

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How I saved 2.2 terabytes by disabling compression 17 February 2019 - 3 comments

As part of the procedure for making sure a large set of work-related data remains intact and recoverable, I keep backups at home.

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Online boardgaming with Tabletop Simulator 21 November 2018 - 1 comment

After some strong hints, I joined Steam and bought Tabletop Simulator.

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Fixing "Vendor Image Mismatch" on LineageOS 17 August 2018

Every so often, after a LineageOS upgrade, the device starts to complain on reboot about a "Vendor Image Mismatch": the underlying Android code has become outdated. LineageOS doesn't fix this itself; this is firmware which the operating system can't change. Less forgivably, the LineageOS documentation doesn't appear to mention the problem. Here's a step-by-step guide to dealing with it, using the Linux command line.

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Happiness is a warm SSLLabs test 11 August 2018 - 1 comment

I've recently set up HTTPS on the servers at work, running in parallel with HTTP. For reasons which were good at the time and are still not entirely wrong, we're using lighttpd as a front-end, and the process was less trivial than I'd have preferred.

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Wireless networks in the wild 05 July 2018 - 4 comments

I've been running a wireless network receiver while out (mostly driving) with the smartphone, logging beacons and locations.

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More apps for the smartphone 11 June 2018

Part 2 of an occasional series.

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OpenVPN on LineageOS 27 May 2018

Since I have a bunch of useful things on servers at home, I was interested in using OpenVPN on the phone to get at them.

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Jelly Comb folding Bluetooth keyboard 21 May 2018

Because I knew I was going to be using Termux quite a lot, I got a bluetooth keyboard to use with my phone. It turns out to be really rather good.

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Osmand+ 19 May 2018

I've replaced the fairly basic Maps program I was using on my shinyphone with Osmand+.

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Entering the 21st Century 15 May 2018 - 4 comments

I've finally found a smartphone that falls within my parameters for the three Ps: price, performance and paranoia.

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Finding Supermarket Fuel 28 April 2018

A reader (hi Dave!) suggested extending the supermarket-finder to locate supermarket fuel near motorway junctions.

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Finding Tesco 18 April 2018 - 8 comments

Well, my wife wanted a sandwich while we were on the road. And unlike me she is particular about what she likes to eat, so she wanted to find branches of Tesco. This is a job for: COMPUTERS!

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A free countdown timer 12 December 2017 - 2 comments

When I'm playing play-by-forum games, there's often a deadline. Because players are scattered across the world and many people are bad at time zones, it's helpful to have a countdown to remind people how much time is left. So I made one.

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Building a File Server 4: maintenance 18 October 2017

In this (probably final) part of the series on building a file server, I'll talk about keeping the thing running once you've got it. This is specific to the ZFS approach.

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Building a File Server 3: software 03 October 2017 - 1 comment

In this part of the series on building a file server, I'll talk about software.

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Building a File Server 2: hardware 25 September 2017 - 2 comments

In part 2 of this series on building a file server, I'll talk about hardware selection.

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Building a File Server 1: planning 18 September 2017 - 2 comments

Many people these days want to store more data than can be conveniently accommodated on one hard disc. You can buy boxes to store files, or build your own. I've built and upgraded several, and in these posts I'm going to talk about how I did it.

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Lies that git will tell you 14 September 2017

I do actually like git. I find it needlessly obfuscatory and deliberately confusing in its syntax and terminology, but it basically does its job reasonably well. However, there are some popular blatant untruths that I think people would do well to know about.

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Mainland European Internet 27 August 2017

Some recent experience using hotel- and guest-house Internet services while travelling through Germany, Sweden and Finland.

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Building My Second First CPAN Module 13 August 2017 - 4 comments

I wrote a CPAN module back in the day. Let's not talk about it; it wasn't very good. Recently the local Perlmongers group (ThamesValley.pm) encouraged me to modularise and release some newer code.

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The units program as a command-line calculator 28 July 2017

The units(1) program is available on many Unix systems (though rarely installed by default). Most people think of it as a simple interactive converter. It's actually much more powerful than that.

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Lenovo Laptop Repairs 10 July 2017

'Twas on a Wednesday evening that the laptop did break down... failing to come out of suspend after having been moved, with the 1-3-3-1 beep code that, on Lenovo machines at least, indicates a memory or system board problem. I cleaned up the DIMM contacts and it worked happily for a day, then died again on Thursday night, and more cleaning and re-seating didn't help. Time for a warranty repair.

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Some technical thoughts on podcasting 08 July 2017 - 1 comment

I've been podcasting for over four years now, I'm now getting game recordings together for the Whartson Hall Æthernauts too, and I hope some of this advice may be useful to people who are getting started.

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The Tripartite Problem Report 22 June 2017

I think I have come up with a new and potentially useful paradigm for computer-related problem reports.

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World Service Pi 11 November 2016 - 2 comments

My wife likes to listen to the radio at night. But Radio 4 is getting increasingly annoying (even I notice this; I don't listen to the speech, but I do pick up the vocal intonations, which over the last couple of years have become increasingly aggressive even when the subject is not one that would seem to deserve it) and the World Service is preferred.

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Garmin Drive favourites and Linux 16 October 2016

Getting "favourites" (stored locations) on and off the Garmin Drive navi is slightly more fiddly than it needs to be, but doesn't require Windows even slightly. Here's what worked for me.

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How To Use a Garmin Drive navi with Linux 27 September 2016

I have recently purchased a Garmin DriveSmart navigation unit. It is quite possible to get this up and running, legally, without buying a copy of Windows or Mac OS. Here's how. I believe this will also work with DriveAware and DriveLuxe models.

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Farewell to systemd 22 May 2016 - 6 comments

I tried to give it a fair shake. Really I did. But systemd has now annoyed me to the point where I've been removing it from the systems for which I'm responsible and bringing back sysvinit.

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New Search Engine at Work 26 April 2016

We recently switched to a new search engine at work, largely written by me with a standard back-end library.

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More Internet of Things 09 April 2016 - 3 comments

A recent news item on Revolv home hubs made me want to revisit my feelings on the Internet of Things.

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Ubiquiti Unifi AP 03 April 2016 - 1 comment

This is simply the best wireless access point I have used.

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Blog Search Engine 18 March 2016 - 8 comments

The blog now has a search engine, powered by Lucy.

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Anker SATA dock 09 March 2016 - 4 comments

I've had a general-purpose IDE/SATA connector for a few years, but it runs into a 2TB limit with modern large drives.

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Why not a root shell? 09 February 2016 - 3 comments

Many modern Linux systems assume that you will never have a root shell. Instead, you are expected to prepend "sudo" to every root-type command.

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Lenovo/IBM warranty service 17 January 2016

It used to be traditional on a personal blog to rant about the horrible service one had received from a big company. (These days it does no good unless it's on Twitter or Facebook.) But there doesn't seem to be enough of the other side.

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Internet of Things 28 December 2015 - 4 comments

This has been a year when "Internet of Things" devices became relatively mainstream. Oh dear.

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Let's Encrypt at firedrake.org 05 December 2015 - 2 comments

Let's Encrypt has moved to public beta, and I've taken advantage of it. Why? Because a non-zero proportion of the people intercepting your web traffic are bad guys. The less plain-text traffic is out there, the less they learn.

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Introducing pyromachy 15 September 2015 - 7 comments

My old file server is Full. So it's time to build a new one. All images are cc-by-sa.

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Networking without network-manager 07 March 2015

I don't like network-manager. It's too big and complicated and hard to persuade to do the things I want. Fortunately it's not too hard to do without it.

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Blog Spam 15 February 2015 - 6 comments

This blog remains spam-free, mostly because I see all comments before they go up.

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Ideas for a 4X game 27 January 2015 - 5 comments

Back in the day I played quite a lot of VGA Planets. Now I'm thinking, not for the first time, about writing a computer game in the same broad style.

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Replacing Chronicle 25 December 2014 - 1 comment

"It all looks different this morning!"

I've been using chronicle since I started this blog in January of this year, but the time has come to replace it.

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Thanks, Google! 20 December 2014 - 1 comment

It was really useful to be able to plot arbitrary data onto a zoomable map. The only service to offer this was Google Maps; indeed, it was the last thing for which I was using any Google service.

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The perils of in-band signalling 28 November 2014

It's often tempting, but usually an error, to allow control signals to be sent by the same channel as the data. This is an example of why.

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The Live Tracker 01 November 2014 - 2 comments

When I'm driving, I may get caught in traffic or have to divert round roadworks. If that happens, I don't want to pull in to call whoever's at my destination; that'll just make me even later, and on the motorway there aren't many opportunities to stop. But the machinery that I'm already using to log my trips knows my position anyway…

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Fun with Couriers 18 October 2014 - 1 comment

Every so often a server for which I'm responsible fails, and I get it shipped to me for fixing. Usually this works reasonably well.

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The Haas Effect in Audacity 09 July 2014

The podcast for which I do sound tech (yes, all right, I'm also one of the speakers and writers) sometimes uses old recordings as interstitial music.

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Plotting onto Tactical Pilotage Charts 10 June 2014

Sometimes my interests intersect. I've been working on a way to plot markers and objects onto real-world charts.

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Setting up a headless Raspberry Pi under Linux 05 June 2014 - 2 comments

I have a checklist for setting up a Raspberry Pi, which I run through before I do any task-specific customisation. It occurred to me that people might find this useful.

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Augmenting Chronicle 19 May 2014

I've been keeping this blog since the beginning of the year, and it's gradually been accreting ancillary code.

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