Iterate on files using bash (template to convert PNGs and JPEGs to WebPs)

cwebp

#!/bin/bash

for f in /tmp/*.{JPG,jpg,PNG,png};
do
	FILE="$f.webp"
	if [ ! -f $FILE ]
	then
		echo "Converting image $f to $(basename $f).webp";
	else
		echo "WebP image $(basename $f).webp does exist";
	fi	
done