urldecode using bash as per http://stackoverflow.com/a/37840948/1510621

define_urldecode_bash_function.sh

# usage: $ urldecode https%3A%2F%2Fgoogle.com%2Fsearch%3Fq%3Durldecode%2Bbash
# result: https://google.com/search?q=urldecode+bash

urldecode() { : "${*//+/ }"; echo -e "${_//%/\\x}"; }