As stated in the title, I want to search for PNG's in a (sub-)folder structure with the meta tag software set to the value GNOME::ThumbnailFactory and delete them with a single bash command.Have the story behind it, you can skip that if you want:I scrapped my Ubuntu ext filesystem by formatting the drive, and then decided to save my files with PhotoRec. My problem now is that now I have all my files wildly distributed in some sub-folders, and guess it, the hidden Gnome Thumbnail folder is also evenly distributed in it and way larger than the original files because it also indexed my external harddrive I had mounted on it sometimes. I found out all of them had the PNG Software Tag set to the GNOME::ThumbnailFactory value by looking at some of them with ExifToolGUI in Windows, but I'm not able to find out how I can do that and delete them according to the results with a Linux Command Line Tool, and I'm not very proficient with grep to be honest.
Searching Files according to PNG Meta-Tags
files;file metadata;png
You can do this using ImageMagick. Once ImageMagick is installed, use command identify -verbose image.jpg and pick what you want from the output using grepfind / -name *.png -exec sh -c '  if identify -verbose ${file} | grep your_pattern_here  then    echo ${file} # or do something else here, e.g. rm  fi' {} \;