Do you have thousands of old photos that are taking up too much disk space?
1. Download jpegoptim (it is in the Ubuntu repo)
2. Put your photos in a directory (or, like me, organize by months by doing something like:
mkdir -p ~/Photos/2018/11
mv IMG_201811* ~/Photos/2018/11
3. Run jpegoptim like this:
jpegoptim --size=250k ./*.jpg
4. All photos in the directory will be automatically optimized to around 250kiB (change this as you want).
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko