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The classic software for doing this is Graphviz and its "dot" language.
There are several language bindings available, for many programming languages, actually. Many apps are built on top of graphviz, see Wikipedia article.
There is a very comprehensive repository "Awesome Graphviz" with lots of graphviz related links.
Recently I came ...
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Open Source Distributed SQL
Is there an open source SQL database specifically designed or optimized for scaling on clusters built from commodity hardware?
Why yes! There are. :)
Here are a handful of open source SQL-compliant distributed database systems. This list is not exhaustive, I suggest looking into each to compare the feature sets.
CockroachDB
...
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I had to search Beowulf cluster on Google because I never heard about it.
This is a problem you had in the '90 and that doesn't exists any more. That problem existed when you home lab was sort of this:
But today your home lab is like this:
So there are no more problems of scaling since 20 years because your Hard Drive is a SAN that takes multiple hard ...
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If you want to get hold of MIME parts that don't have filenames, e.g. the text and HTML, then try
sudo apt install maildir-utils
mu extract source.eml --save-all
Docs: https://manpages.debian.org/testing/maildir-utils/mu-extract.1.en.html
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