Optimize Images with Imagemin while Preserving Directory Structure

optimize-images.sh

#!/bin/sh

find ./public/images -type f \( -iname \*.jpg -o -iname \*.png -o -iname \*.svg \) | xargs -I % sh -c 'imagemin % -o $(dirname % | sed --expression="s/public/&\/optimized/")'

# `find`    - Look for files in the specified path
#   -type f - Filter the files to only include regular files
#   \( \)   - Group statements so that the previous flag (-type f) applies to all following statements
#   -iname  - Look for files with specified names, case insensitive
#   -o      - OR operand
#
# xargs - Build and execute command
#   -I %       - Replace occurences of % with names read from stdin
#   sh -c      - Executes the following command string with sh
#   imagemin % - Executes imagemin to optimize image, % being replaced by xargs with names from the find part of the command
#     -o - Designate the output directory
#       dirname % - Trims the last part of the file path so that only the directory path remains
#       sed       - Execute string transformation with following parameters
#         --expression="s/public/&\/optimized/" - Look for string 'publi' and append it with '/optimized'