Here’s just a quick note to my future self (other people are free to take part of it too though).
When using the * character to unzip several files using the unzip command on a Mac, the * has to be escaped as unzip wants to do its file listing by itself, rather than having bash do it for it.
So instead of writing unzip *.zip, you would write \*.zip.
Also as a final note to self, to unzip several zip-files into e.g. the parent directory and also ignore any directory structure contained by the zip file + overwriting any duplicate files, one would write
unzip -o -j -d ../ \*.zip
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