Bash-URL-decode

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URL decode in bash

#!/bin/bash
function urldecode() { : "${*//+/ }"; echo -e "${_//%/\\x}"; }
urldecode "$(cat $1)"

overflow source and details

$ x="http%3A%2F%2Fstackoverflow.com%2Fsearch%3Fq%3Durldecode%2Bbash"
$ y=$(urldecode "$x")
$ echo "$y"
http://stackoverflow.com/search?q=urldecode+bash

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Bash