## Costco Fuel Price script for a Home Assistant sensor

### Home Assistant configuration.yaml

To execute your shell script every 6 hours and expose the extracted fuel prices as sensors in Home Assistant, you'll follow these steps:

1) Create the Shell Command in Home Assistant
Ensure that the shell command integration is enabled in your Home Assistant configuration by adding this to configuration.yaml:

```
shell_command:
  fetch_costco_fuel_prices: /config/scripts/fetch_costco_prices.sh
```

Save your script as fetch_costco_prices.sh in the /config/scripts directory or modify the path accordingly.

2) Add a Command-Line Sensor for Each Variable
Use command-line sensors to expose the extracted values. Here's how you can do it in your configuration.yaml file:

```
sensor:
  - platform: command_line
    name: Costco Premium Diesel
    command: "bash /config/scripts/fetch_costco_prices.sh | jq -r '.premium_diesel'"
    scan_interval: 21600 # Every 6 hours
  - platform: command_line
    name: Costco Premium Unleaded
    command: "bash /config/scripts/fetch_costco_prices.sh | jq -r '.premium_unleaded'"
    scan_interval: 21600 # Every 6 hours
  - platform: command_line
    name: Costco Unleaded Petrol
    command: "bash /config/scripts/fetch_costco_prices.sh | jq -r '.unleaded'"
    scan_interval: 21600 # Every 6 hours
```

Here, scan_interval: 21600 sets the sensors to update every 6 hours (21600 seconds). The command extracts the respective JSON values from the script output using jq.

3) Make Sure Dependencies Are Installed
For this setup:

curl should already be installed on most systems.
Ensure jq is installed (used to parse JSON output). On Debian-based systems, you can install it using:

```
sudo apt-get install jq
```

4) Testing the Configuration
Before restarting Home Assistant, validate your configuration:

```
ha core check
```

If no errors are shown, restart Home Assistant to apply the new configuration:

```
ha core restart
```

This configuration will execute the script every 6 hours to retrieve the latest fuel prices and expose them as sensors in Home Assistant. You can then use these sensors in automations, dashboards, or other components as needed.