tinypng.sh
This is a very simple bash scripts that makes easier for you to use the API from https://tinypng.com/ to compress your images.
To run this you need to have only curl and jq installed.
Usage
You will need to apply for an API KEY on https://tinypng.com (free tier avaialable) and export a variable with the name TINYPNG_KEY on your environment.
$ tinypng.sh ImagePath.png