Coinmarketcap.com api crypto info - bash script

#!/bin/bash
#By Jean-Baptiste Fleury <jean-baptiste.fleury@epitech.eu>

if [ -z $1 ]
then
    echo "USAGE: ./crypto.sh [SYMBOL]"
    exit
fi

curl https://api.coinmarketcap.com/v1/ticker/?convert=EUR -s > /tmp/cmc_api.txt
line=` cat /tmp/cmc_api.txt | grep -n "\"symbol\": \"$1\"" | cut -d: -f1`

cat /tmp/cmc_api.txt | tail -n +$line | head -n +16 | tr -d \" | tr -d ,