toWebP.sh

#!/bin/bash
# usage examples:
# toWebP.sh "*.png" # convert all png's in current directory
# toWebP.sh "icon-*.jpg" # convert all jpg's that start with "icon-"

if [ $# -eq 0 -o -z "$1" ]; then
    echo "No file pattern supplied";
    exit 1;
fi

for file in $1
do
  echo "Converting $file";
  cwebp -q 80 "$file" -o "${file%.*}.webp"
done