etherscan lookup shell function

etherscan.sh

# add this to your shell init code, i.e. .zshrc
function etherscan() {
  url="https://etherscan.io"

  if [[ -z "$1" ]]; then
    open $url
  else
    case ${#1} in
    42) # 42 chars => account address
      open "${url}/address/${1}"
      ;;
    66) # 66 chars => transaction hash
      open "${url}/tx/${1}"
      ;;
    *)
      # <8 chars => block number
      if ((${#1} <= 8)); then
        open "${url}/block/${1}"
      else
        echo "Unknown input"
      fi
      ;;
    esac
  fi
}