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(relies on 'imagemagick')
Convert all .png files to .gif. This can also go the other way if you reverse the file extensions in the command, e.g.:
for file in *.gif; do convert "$file" "$(basename $file .gif).png"; done
If the file is named 'example1.png' it will be named 'example1.gif' when it is complete.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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