url_decode()
{
decode="${*//+/ }"
eval print -r -- "\$'${decode//'%'@(??)/'\'x\1"'\$'"}'" 2>/dev/null
}
url_decode "http%3A%2F%2Ffoo%20bar%2F"
url_decode "google.com/search?q=%60Abdu%27l-Bah%C3%A1"