Martin Tournoij reformatted «The Art of Unix Programming» by Eric S. Raymond. See his easy-to-read, searchable, single-page version of this oldie-but-goodie from 2003 right here. Thanks! 🙏🏻🎉RC Logr 20190503 115158 - Martin Tournoij reformatted …
Here be my pithy, short, technical nuggets. Maybe I’m the only one who cares. Who says Hugo can’t be used for microblogging‽
03 May 2019
🗓 "Constitution Day" in Japan
30 Apr 2019
🗓 "Special Holiday for Emperor's Abdication" in Japan
One mistake I often see beginning front-end devs make is, not knowing the difference between an absolute path (/img/logo.png) and a relative path (img/logo.png). It will serve you well to know this. 👍
Terminal usage has similar characteristics, with
cd /bin and
cd bin changing to the bin off the root of the file system and the bin in the current folder, respectively.
14 Apr 2019
Given a json file, used say for a search index, you can easily use «jq» from stedolan to extract what you need from it. 👻 It is as simple as piping the json to
jq, and using its powerful filtering to extract what you need. I generate the search index for this site in json, because that is what lunr requires, but it doubles as a source for the info I use to tweet about a new post.
Given a json like this:
… I use something like this to extract what I want to tweet:
That pipes the index json file to
jq, gets the 0th (first and latest) node, then pipes it extracting and concatenating the values of the
.ref keys, limiting the
.content value to 75 characters. With
jq, concatenation to string literals is done with a plus sign. The statement within the single quotes is where the work is done, and it can be multiple filters with pipes between.
13 Apr 2019
Apple iCloud Drive has its place and works well for syncing data for certain apps to «all teh devices», but it really causes trouble sometimes. It especially did not play well with some secure
.sparseimage files I had stored in
$HOME/Documents on my Mac. 😳
To wit, I was sometimes getting unwanted copies of my secure disk images, and other files under
$HOME/iCloud Drive (Archive) or
$HOME/Documents - rickmac. To fix I created
$HOME/docs, outside the paths iCloud drive targets for syncing, and migrated the files there. Anything that is not needed on my mobile devices is getting chucked in this new folder.
Sync is hard and here are a few commands to aid macOS users in no order:
You may need to stop and restart iCloud Drive, or restart the computer.RC Logr 20190413 121627 - Apple iCloud Drive has its …
12 Apr 2019
Static site generator «Hugo 0.55.1» was released, with three bug fixes. Go static! 🚀 #gohugo #jamstack #golang #webdevRC Logr 20190412 233559 - Static site generator «Hugo …
MacOS or Linux users, you might find log file viewer «lnav» useful. It is for viewing local log files, and requires no server like Splunk. Fire it up, press
? to toggle help or
/ to search. 🕵🏻
11 Apr 2019
The first black hole “photo” is incredible, and before her credit gets sucked into said black hole, it was Dr. Katie Bouman came up with the clever computer algorithm to capture it. She explains how, from the TED stage. (Say it in @GuyRaz’s voice) What an inspiration to young women considering a career in STEM! 👭
A couple of technical tidbits:
- the black hole is so far away, 53 million light years, that it required use of the planet-sized EHT or Event Horizon Telescope. The EHT is 8 observatories across the globe, using interferometry to combine the data.
- there was petabytes worth of data, and it had to be ferried around via essentially “sneakernet”, since some of the locations don’t have good Internet connections and there was simply too much data to send via wire.
- Dr. Bouman herself has said it was a team effort, and indeed it was a team of 200 astronomers world wide.
- Scientists on the team estimate the mass to be 6.5 billion times as massive as our sun.
Read about it here from MIT news office.RC Logr 20190411 071927 - The first black hole …
10 Apr 2019
Saw @AdobeType post that they are adding the #Reiwa era single-kanji character to their Japanese type faces such as Source Han Sans. This is the single-kanji version of the era name, like the Unicode ㍻ U+337B «square era name heisei». 🇯🇵RC Logr 20190410 093015 - Saw @AdobeType post that they …
Turns out birds are not so bird-brained after all, per the «Birdsong» episode of the fantastic 20000 Hz podcast @20korg (20K Hz is the typical upper limit of human hearing). Birds have a pharynx like humans, but sing with their syrinx, an organ at the base of the trachea. 🐦🐧
Some awesome examples from the episode:
- the New Zealand kokako can produce organ-like chords
- the African Grey Parrot can mimic human speech
- Mockingbirds can mimic other birds and even frogs
- the Australian Lyre bird and its uber-complex syrinx can mimic whatever it hears!
It’s worth a listen, and birds are cooler than you might imagine!RC Logr 20190410 075101 - Turns out birds are not so …
09 Apr 2019
PSA: A serious bug was discovered in Apache, the web server that powers a lot of the internet. Vulnerability CVE-2019-0211 allows scripts to be executed with root privileges, allowing system takeover especially on shared hosting environments. 🐞☠️
Apache foundation released patched version 2.4.39, so confirm and update (or request an update):
You might need to confirm from your “control panel” in a shared environment. Note that Apache sysadmins can make settings to block these tools from getting any details about the web server. Same caveat applies, but you can also put
<?php phpinfo() ?> in a file like
info.php, then serve and access it.
After upgrading to static site generator «Hugo 0.55.0», building with
hugo server -D returns a couple of non-fatal warnings that should be corrected. 🐞
.Site.Pagesincludes section pages so you might need to change it to
.Site.RegularPages. I was building an
index.jsonfor searching and relying on it to supply data to a script, but after the upgrade, the index included pages with no content. To fix, I just changed to the latter.
- When you get
Page's .Hugo is deprecatedyou just need to change from something like
.GetParamis being deprecated, so see if you can just access the param directly. For example, indicating what posts are in draft form:
Static site generator «Hugo 0.55.0» was released, we got a lot of great new features to play with, and it is even faster and more flexible. Go static! 🚀RC Logr 20190409 071904 - Static site generator «Hugo …
08 Apr 2019
Today I learned about «Lynis», an agentless security auditing tool for
*nix-based systems, that lets you do compliance testing e.g. for HIPAA or SOX, pen testing, vulnerability detection to help you harden systems. I ran it and it appears to work well and returns useful suggestions after it runs, e.g. install this, disable that, confirm the other. 🤖
This is what the first few lines of the results look like:
(via @binitamshah on Twitter)RC Logr 20190408 145501 - Today I learned about «Lynis», …
«Cargo Cult» programming is a waste of time and effort. The best way is to understand fully, so do not ritually include features that serve no purpose, nor copy-paste code you do not understand. ✈📦RC Logr 20190408 061136 - «Cargo Cult» programming is a …
06 Apr 2019
I often need to replace dates in the frontmatter of markdown files, in «RFC 3339» format for content in static site generator Hugo. A simple shell function using gnu date, sed, head and pbcopy puts the current timestamp on the clipboard easily. 👻
Here is how it works:
- Gnu date with the
--rfc-3339switch gives us a timestamp like
2019-04-06 18:38:19+09:00, is piped to…
sedwhich replaces the space with a T, then that is piped to…
headto remove the trailing newline, which is finally piped to
pbcopyto put the result on the clipboard (MacOS only).
Then just paste it where you need it. By the way, the timestamp means “18:38:19 in the timezone +9 hours ahead of GMT”, or, Japan time.RC Logr 20190406 181729 - I often need to replace dates …
05 Apr 2019
You can use the Haversine formula to approximate the «great-circle» distance between points on the globe, to get, say, the distance between map locations expressed in latitude and longitude. 🗺
To avoid storing a credential in command line history, you can store it in a file and use
cat to insert it when you need it. 🤓 Say you have your API token stored in
/path/to/token, here is how you might use that: