Reads the coinmarketcap ticker and writes the prices for a cryptocoins to a file

coinmarketcap-parse.sh

#!/bin/bash

get_data() {
	# if the parameter is a local file just cat it (for testing) otherwise try curl
	{ test -r "$1" && cat "$1" || curl -s "$1"; } | \
		jq --raw-output \
			'.[] | "\(.symbol | ascii_downcase) \(.price_usd)"'
}

process() {
	read -r filename price <<< $(get_data "$1")
	printf "\$filename: %s\t\$price: %.2f\n" "$filename" "$price"
	#echo "$price" > "$filename"
}

if [ ${#} -gt 0 ]; then # read urls from args on the command line if there are any
	while [ ${#} -gt 0 ]; do
		url="$1"
		shift
		process "$url"
	done
else # read urls from stdin
	while read -r url; do
		process "$url"
	done
fi