GNU parallel Updated 2025-07-16
The author Ole Tange answers every question about it on Stack Exchange. What a legend!
This program makes you respect GNU make a bit more. Good old make with -j can not only parallelize, but also take in account a dependency graph.
Some examples under:
man parallel_exampes
To get the input argument explicitly job number use the magic string {}, e.g.:
printf 'a\nb\nc\n' | parallel echo '{}'
sample output:
a
b
c
To get the job number use {#} as in:
printf 'a\nb\nc\n' | parallel echo '{} {#}'
sample output:
a 1
b 2
c 3
c 3
{%} contains which thread the job running in, e.g. if we limit it to 2 threads with -j2:
printf 'a\nb\nc\nd\n' | parallel -j2 echo '{} {#} {%}'
sample output:
a 1 1
b 2 1
c 3 2
d 4 1
The percent must be a reference to "split the inputs module the number of workers", and modulo uses the % symbol in many programming languages such as C.
To pass multiple CLI arguments per command you can use -X e.g.:
printf 'a\nb\nc\nd\n' | parallel -j2 -X echo '{} {#} {%}'
sample output:
a b 1 1
c d 2 2
GNU Project Updated 2025-07-16
Go engine Updated 2025-07-16
Goiânia accident Updated 2025-07-16
Video 1.
One handful contaminated a city by Kyle Hill (2021)
Source.
Golden (wiki) Updated 2025-07-16
April 2024: merged with some fraud protection thing, is it sill a Wiki? Unclear, seem sto have lost that aspect: twitter.com/judegomila/status/1783028847983956430
techcrunch.com/2019/04/30/golden-launch/
To state the obvious: Wikipedia is an incredibly useful website, but Gomila pointed out that notable companies and technologies like SV Angel, Benchling, Lisk and Urbit don’t currently have entries. Part of the problem is what he called Wikipedia’s “arbitrary notability threshold,” where pages are deleted for not being notable enough. (This is also what happened years ago to the Wikipedia page about yours truly — which I swear I didn’t write myself.)
Exactly! Deletionism on Wikipedia is so sad, and especially for companies. In particular e.g. Ciro Santilli tried to create a page for PsiQuantum, and it got reverted... and now golden has one of the largest Google hits for it: golden.com/wiki/PsiQuantum-PBDGXRA
TODO how do they do moderation?
As of April 2024
Login is currently disabled.
Asked at: twitter.com/cirosantilli/status/1777250258235302233 Their last tweets were from August 2023, so maybe they just silently shutdown? Their name is too generic and hard to search for efficiently...
They do have knowledge graph built-in which is cool.
Gold leaf Updated 2025-07-16
Video 1.
Hands: A Dublin Bookbinder
. Source. Some awesome gold leaf action!
Hermitian form Updated 2025-07-16
The prototypical example of it is the complex dot product.
Note that this form is neither strictly symmetric, it satisfies:
where the over bar indicates the complex conjugate, nor is it linear for complex scalar multiplication on the second argument.
Good targets for amateur astronomy Updated 2025-07-16
Looking at most astronomical object through a telescope is boring because you only see a white ball or point every time. Such targets would likely only be interesting with spectroscopy analysis.
There are however some objects that you can see the structure of even with an amateur telescope, and that makes them very exciting.
Some good ones:
Google Books Updated 2025-07-16
They scanned a bunch of books, and then allowed search results to hit them. They then only show a small context around the hit to avoid copyright infringement.
Bibliography:
Google Street View Updated 2025-07-16
Street View's go into the past mode is the dream of every archaeologist. Ciro can only dream of a magic street view that allows going back to earlier centuries and beyond... isn't it amazing to think that people in the future will have that ability to time travel back to around the year 2006? Ciro wonders how long Google will be able to keep storing data like that.
Thanks, CIA.

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