function get_asset {

  g_echo_note "RUNNING FUNCTION ${FUNCNAME} $@"
  local f_ASSET="$1"

    # write asset hist file with macd and rsi
    local f_ASSET_HIST_FILE="asset-histories/${f_ASSET}.history-raw.csv"
    [ -f "${f_ASSET_HIST_FILE}" ] || echo "Date and Time,Price" >"${f_ASSET_HIST_FILE}"
    if ! grep -q "^$(echo "${f_timestamp}" | cut -d: -f1,2)" "${f_ASSET_HIST_FILE}"
    then
      local f_line="${f_timestamp},$(egrep "^${f_ASSET}," EXCHANGE_GET_ASSETS_CMD_OUT | cut -d, -f2)"
      echo "${f_line}" >>${f_ASSET_HIST_FILE}

      local f_linecount=0
      local f_last_price=0
      local f_lines="$(tail -n 51 "${f_ASSET_HIST_FILE}" | wc -l)"
      
      for f_price in $(tail -n 50 "${f_ASSET_HIST_FILE}" | grep "^[0-9]" | cut -d, -f2)
      do
        if [ "$f_last_price" == "$f_price" ]
        then
          continue
        fi
        let "f_linecount+=1"
        f_last_price=$f_price
      done

      if [ ${f_linecount} -le 3 ] && [ ${f_lines} -ge 50 ]
      then
        g_echo_note "${f_ASSET_HIST_FILE}: price seems not to change - ignoring"
        return 0
      fi
      
      f_ASSET_HIST_FILE="asset-histories/${f_ASSET}.history.csv"
      if [ ${f_linecount} -lt 30 ] && [ ${f_lines} -ge 50 ]
      then
        g_echo_note "${f_ASSET_HIST_FILE}: set price to 5 minute period"
        if ! echo "${f_timestamp}" | egrep -q ":[0-5]0:|:[0-5]5:"
        then
          return 0
        fi
      fi

      # headline
      [ -s "${f_ASSET_HIST_FILE}" ] || echo 'Date and Time,Price,Price Change,EMA12,EMA26,MACD,EMA9 MACD (Signal),MACD Histogram,MACD Signal,RSI5,RSI14,RSI21,RSI720,RSI60,RSI120,RSI240,RSI420,Price Change 24h,Price Change 7d,Price Change 14d,Price Change 30d' >"${f_ASSET_HIST_FILE}"

      # date and price
      echo -n "${f_line}" >>${f_ASSET_HIST_FILE}

      # calculate price change percentage
      f_last_price=$(tail -n2 ${f_ASSET_HIST_FILE} | head -n1 | cut -d, -f2)
      if echo $f_last_price | grep -q "^[0-9]"
      then
        f_price=$(tail -n1 ${f_ASSET_HIST_FILE} | cut -d, -f2)
        local f_price_change=$(g_percentage-diff ${f_last_price} ${f_price})
      else
        local f_price_change=""
      fi
      echo -n ",${f_price_change}" >>"${f_ASSET_HIST_FILE}"
      
      # calculate macd and rsi
      get_macd_indicator ${f_ASSET_HIST_FILE}
      get_rsi_indicator ${f_ASSET_HIST_FILE} 5
      get_rsi_indicator ${f_ASSET_HIST_FILE} 14
      get_rsi_indicator ${f_ASSET_HIST_FILE} 21
      get_rsi_indicator ${f_ASSET_HIST_FILE} 720
      get_rsi_indicator ${f_ASSET_HIST_FILE} 60
      get_rsi_indicator ${f_ASSET_HIST_FILE} 120
      get_rsi_indicator ${f_ASSET_HIST_FILE} 240
      get_rsi_indicator ${f_ASSET_HIST_FILE} 480
      
      # get coingecko price change
      local f_asset=$(echo ${f_ASSET} | sed "s/${CURRENCY}\$//" | tr '[:upper:]' '[:lower:]')
      echo -n ,$(jq -r ".[] |select(.symbol==\"${f_asset}\")|\"\\(.price_change_percentage_24h_in_currency)\"" COINGECKO_GET_ASSETS_CMD_OUT) >>${f_ASSET_HIST_FILE}
      echo -n ,$(jq -r ".[] |select(.symbol==\"${f_asset}\")|\"\\(.price_change_percentage_7d_in_currency)\"" COINGECKO_GET_ASSETS_CMD_OUT) >>${f_ASSET_HIST_FILE}
      echo -n ,$(jq -r ".[] |select(.symbol==\"${f_asset}\")|\"\\(.price_change_percentage_14d_in_currency)\"" COINGECKO_GET_ASSETS_CMD_OUT) >>${f_ASSET_HIST_FILE}
      echo -n ,$(jq -r ".[] |select(.symbol==\"${f_asset}\")|\"\\(.price_change_percentage_30d_in_currency)\"" COINGECKO_GET_ASSETS_CMD_OUT) >>${f_ASSET_HIST_FILE}
      
      # end with newline
      echo "" >>${f_ASSET_HIST_FILE}
    fi
}