For checking the balance of several bitcoin addresses in a text file

check-wallets.sh

#!/usr/bin/env bash
# For format of 64 chars without 0x at the start

# Source script from: https://github.com/grondilu/bitcoin-bash-tools.git
source ./bitcoin.sh

while read k; do
  PUBLIC=$(newBitcoinKey 0x$k \
    | grep bitcoin\ address \
    | head -1 \
    | cut -f 2 -d ":" \
    | tr -d " ")
  BALANCE=$(wget -qO- blockchain.info/rawaddr/$PUBLIC 2>&1 \
             | grep -Po '"final_balance":\K[0-9]+')
  if [ -n "$BALANCE" ]; then
    echo $k,$PUBLIC,$BALANCE
  fi
done < keys.txt