# Rooms occupancy subscribe

Use the `ably rooms occupancy subscribe` command to subscribe to real-time occupancy metrics for a chat room.

## Synopsis

<Code>

### Shell

```
ably rooms occupancy subscribe <room-name> [options]
```
</Code>

## Arguments

### `room-name`  **(Required)**

The name of the chat room to subscribe to occupancy metrics for.

## Options

### `--duration | -D` 

The duration in seconds to subscribe for before automatically unsubscribing.

### `--client-id` 

A client ID to use for the subscription.

### `--json` 

Output results as compact JSON. Mutually exclusive with `--pretty-json`.

### `--pretty-json` 

Output results in formatted JSON. Mutually exclusive with `--json`.

### `--verbose | -v` 

Enable verbose logging. Can be combined with `--json` or `--pretty-json`.

## Examples

Subscribe to occupancy metrics for a room:

<Code>

### Shell

```
ably rooms occupancy subscribe my-room
```
</Code>

Subscribe for a specific duration:

<Code>

### Shell

```
ably rooms occupancy subscribe my-room --duration 60
```
</Code>

Subscribe to room occupancy in JSON format:

<Code>

### Shell

```
ably rooms occupancy subscribe my-room --json
```
</Code>

## See also

* [Rooms](https://ably.com/docs/cli/rooms.md) — Explore all `ably rooms` commands.
* [CLI reference](https://ably.com/docs/cli.md) — Full list of available commands.

## Related Topics

- [get](https://ably.com/docs/cli/rooms/occupancy/get.md): Get current occupancy metrics for an Ably Chat room using the CLI.

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