# process.arg

## Function

Append a command line argument.

## Syntax

```bt
process(program).arg(value)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| value | Any | No | None | The parameter to be appended will be converted to a string first when calling. |

## Return value

| Type | Description |
| ------ | ------ |
| Process | Returns the new process builder. |

## Example

```bt
cmd = process('cmd').arg('/C').arg('echo BT')
result = cmd.get_args()

// Output: ["/C","echo BT"]
print result
```

## Notes

- The example uses Windows cmd; Linux/macOS can be changed to process('sh').args(['-c', 'echo BT']).