how to resize multiple to image Ubuntu/Manjaro

Ubuntu

Terminal:

sudo apt-get install imagemagick

Manjaro

Terminal:

sudo pacaman -S imagemagick

Note: that commands are in your folder

resize mode default

Terminal:

convert *.jpg -resize 500x500 -quality 100 foto.jpg

resize mode force

Terminal:

convert *.jpg -resize 500x500! -quality 100 foto.jpg

Reducing the file size of a very large images, without changing the image dimensions
first create a folder tmp same level to dictory

Terminal:

mkdir ../tmp

resize all elements jpg to directory

Terminal:

for i in *.jpg; do convert "$i" -quality 40  ../tmp/"$i"; done

up a directory and check to diff

Terminal:

du -smh * | sort -h

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