Technical Support

Lien vers mon diapo sur HashMap

We’ll try to stay in the project root if possible.

Find all non-hidden files to know the file structure.

$ find -path './.*' -prune -o -type f -print
./Algo-init.iml
./out/production/Algo-init/fr/eql/ai114/algo/init/demo/_1_HelloWorld.class
./src/fr/eql/ai114/algo/init/demo/_1_HelloWorld.java

• -prune returns true for the chosen path and prevents find from descending.

• -o means OR, so the paths matching -prune won’t pass through -o.

• -type f selects files, not folders.

• By default, AND is used to connect different conditions.

  [Read More]

Background

We often want to test the output with different values for a parameter. Here’s an example: we have a parameter that pandoc uses to / compile source code files to PDF / M$ Word / etc.

rm output.html; param=0; pandoc input$param.txt -o output.html; \
echo param = $param

In practice, a parameter can be a font, the font size, etc, and there can be multiple parameters.

Problem

I have unprotected

1. input1.pdf
2. input2.pdf

and I want to create one single encrypted.pdf.

My try

I looked up QPDF’s manual and tried the following command.

qpdf --empty --pages input{1,2}.pdf --encrypt upw opw 256 -- encrypted.pdf

but I got this error.

qpdf: unrecognized argument --encrypt (pages options must be terminated with --)

For help:
  qpdf --help=usage       usage information
  qpdf --help=topic       help on a topic
  qpdf --help=--option    help on an option
  qpdf --help             general help and a topic list

Solution

The sentence inside the parentheses says it all.

A brief summary of 10 Incredibly Useful Websites on Medium.

Upword.AI (paid)

summarise stuff

Gamma (free trial for the moment)

get professional slides in min, not open source

IMGCreator (free, point-based)

text/img → img, chatGPT powered

Popsy (free to create, paid to publish)

no-code website buider

Visual Capitalist (free)

explanatory charts

TypeLit.io (free for some œuvres, paid for own book)

type classics out to train typing

Zorp.one (free for trial, paid for deploy)

no-code app generator for businesses, e.g. delivery, store management, doc collection

Kialo (free)

repository for debate arguments, with discussion topology

Nomad List (free limited trial, paid content)

good for remote workers, find remote work opportunities, insights into cities, dating app (that I don’t recommend)

SuperMeme (paid)

AI meme generator

Background

On M$ Win*, I don’t have dedicated PDF readers like Adobe.

During visioconference, one might want to share some downloaded PDFs. Those documents can be part of an ebook or notes. In some situations, they can provide context to a discussion.

Problem

1. Under the same folder, you might have

• downloaded_ebook.pdf
• personal_info.pdf
• other_personal_stuff.pdf that you don’t want to expose while streaming.

However, each downloaded PDF usually comes with a name set by others. It can be tedious to rename them according to your own habits. To protect users’ privacy, we can

Goal

Make the characters larger and more readable.

Solution

The option names might be found in the manual. Sometimes, I find opening MINGW’s settings through GUI helpful.

FontHeight=12
Columns=143
Rows=36

I’ve read Gerald Lee’s .minttyrc. I’ve enlarged the window size so that in the standard output, one line can contain more info.

Background

My old laptop was bought ten years ago. I had never changed the thermal paste between its CPU and its fan. As a result, it had been getting hot during my online tutorials.

Photos

Background

jQuery provides many handy functions to speed up the development, for example document.ready(), element.toggle(), element.hide(), etc. My math editor used some of them. However, I replaced them with Vanilla JavaScript at commit 4a35c45b.

Goal

Some users complained about the white background in the past versions of my editor. That had motivated me to refactor the code, so that it would be easier to maintain and to add in new features.

HTML5 input types used

Actual appearance might vary across browsers.