Install ImageMagic :
apt-get install imagemagick
mogrify - With the use of resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. Mogrify overwrites the original image file, whereas, convert(1) writes to a different image file
e.g Let's resize images
mogrify -resize 500x300 Test/*.png
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