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#For every .jpg in a directory, create a thumbnail (smaller) image at 280 pixels high (or comment out, uncomment similar line, for width: )
#Resize to 280 pixels height
for file in *.jpg; do convert -resize x280 "$file" "t$file"; done
#resize to 280 pixels width
#for file in *.jpg; do convert -resize 280 "$file" "t$file"; done