Batch Resize Images in Mac OS

To resize all the images to maximum height of 640px 
sips -Z 640 *.jpg
To resize all the images to maximum width of 400px 
sips --resampleWidth 400 *.jpg

To resize SVG files in Mac OS, you can use the rsvg library install it with: 
brew install -v librsvg
and then run it with the following shell line: 
for i in *; do rsvg-convert $i -w 100 -h 100 -f svg -o `echo new/$i`; done
This takes all the svg files in the folder, resizes it and copies the result into new/ folder

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