Bash command to resize an image in multiple sizes at once for usage in websites (img srcset tags)

webResize.bash

# You need imagemagick to have the "convert" command available
# Debian based distros => sudo apt-get install imagemagick

# Example command usage :
# $ web_resize coffee.jpg 320 1024 1980
# Will create : 
# - coffee-320.jpg
# - coffee-1024.jpg
# - coffee-1980.jpg

function web_resize() {
  name="${1%%.*}"
  extension="${1#*.}"

  for arg in "${@:2}"; do
    convert $1 -resize "${arg}x${arg}" "${name}-${arg}.${extension}"
  done
}