Bash script which downloads files from archive.org

downloadSiteFromArchive.sh

#!/bin/bash

if [ $# -le 0 ]; then
	echo "Usage: $0 url (outputfilename)"
	exit
fi

if [ $# -eq 2 ]; then
	outputfilename="--output-document=$2"
fi
json=$(curl -s "http://web.archive.org/cdx/search/cdx?url=$1&limit=2&output=json")

if [ "$json" = "[]" ]; then
	echo "Not found"
	exit
fi

datestring=$(echo $json | jq .[1][1] | sed -e 's/^"//' -e 's/"$//')
url=$(echo $json | jq .[1][2] | sed -e 's/^"//' -e 's/"$//')
finalurl="https://web.archive.org/web/${datestring}if_/$url"

wget "$outputfilename" "$finalurl"