Batch fit image in Linux (e.g. GIMP) -

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how can batch fit image under linux?

please note explicitly ask batch fitting images independent of actual orientation of image (e.g. fit 800x600 px max, taken account different orientations of images).

thanks in advance!

you can solve task , many others imagemagick

for example 

 ls *.jpg | xargs -i'{}' convert -resize 800x600 -quality 80 {} {}

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