cdukes

# OS X
# List affected files
find -E . -regex '.*/[-_a-zA-Z0-9]+-[0-9]+x[0-9]+\..+' -print -exec ls '{}' \;

# Remove affected files
find -E . -regex '.*/[-_a-zA-Z0-9]+-[0-9]+x[0-9]+\..+' -print -exec rm '{}' \;

# Downsize all images to 1200px
find . -iname "*.jpg" -type f -exec sh -c 'sips -Z 1200 "$0"' {} \;