As I sometimes come around some useful links which just go missing again I will collect them here:

• Kopf- und Fußzeilen mit scrartcl (in German)
• LaTeX underlines

to be continued...

Early in the summer we had the idea to change the lights on our back porch from various switches inside the garage to something one could control without going anywhere. As I had an old RaspberryPi lying around I ordered a small relay board and installed domoticz to switch the …

I usually listen to music while working and every once in a while I ask myself what the current track might be. I could switch to my music player or have a look in the sound control plugin of the XFCE panel, but that involves clicking or moving the focus …

Merging and rotating PDFs

Merging PDFs can be easily done with pdftk. You can also use this tool to select only specific pages from your document or rotate pages. This is my go-to tool if I don't have to manipulate pages beyond rotation.

To concatenate all PDFs in the working …

Digikam is a very powerful and complex software to manage photos. I was using shotwell previously for quite some time, but it's capabilities are limited. Wherever you go, digiKam is recommended instead.

The best things in digiKam so far are hierarchical tags and automatic face detection. But on the other …

Yesterday I had to convert some JPEG images with a white background into a PNG with a transparent background. While it is possible to do this by just replacing white with transparent, this also replaces white in other parts of the image where this is not intended. So the better …

To download files accessible over HTTP(S) where you are generating their URLs with Python 3, saving can be done with

from urllib.request import urlretrieve
urlretrieve(url, local_filename)

Just as a reminder: Adding status: draft to the header of a pelican source written in Markdown sets the draft mode.

(From the pelican docs)

Very handy list of needed commands: https://www.sslshopper.com/article-most-common-openssl-commands.html

This is especially useful if you hve to check details of a certificate, but also to check which certificate is serverd on non HTTP protocols.

As I am currently setting up a new mail server, I had to test the new server manually (As of now, the DNS records are not changed, so mail clients are problematic).

If you want to test plain text ports like standard postfix, go simply with telnet localhost 25. If …