# AmazonSendSsmCommandParameters Object

## Description

Parameters for the Amazon Send SSM Command action.

## Properties

### commandParameters

Parameters to send with the SSM command.

Type: Array of [SendSsmCommandParameter](/data-types/sendssmcommandparameter-object.md)

Required: No

### credentialIds

Registered credentials to use with the action. One and only one credential must be specified.

Type: Array of `string`

Required: Yes

### documentName

Name of the SSM document to send.

Type: `string`

Required: Yes

### instances

List of EC2 instances to which the SSM command will be sent. Required when `instanceIdentificationMethod` is `by-instance-id`.

Type: Array of `string`

Required: Conditional

### instanceNameComparison

Comparison to use when identifying EC2 instances by `Name` tag. Required when `instanceIdentificationMethod` is `by-instance-name-tag`.

Type: [InstanceNameComparison](/data-types/instancenamecomparison-object-1.md) object.

Required: Conditional

### instanceIdentificationMethod

Method of identifying the EC2 instances.

Type: `string`

Valid Values:

* `all-instances`
* `by-instance-id`
* `by-instance-name-tag`
* `by-resource-tag`

Required: Yes

### regionNames

Regions to use with the action. One and only one region must be specified.

Type: Array of `string`

Required: Yes

### resourceTagComparison

Comparison to use when identifying instances by resource tag. Required when `instanceIdentificationMethod` is `by-resource-tag`.

Type: [ResourceTagComparison](/data-types/resourcetagcomparison-object-1.md) object.

Required: Conditional

### timeoutInSeconds

Timeout for the SSM command. If omitted SSM with timeout after 600 seconds.

Type: `integer`

Required: No

## Sample JSON

```javascript
{
    "credentialIds": [
        "cred-00000001"
    ],
    "regionNames": [
        "us-east-1"
    ],
    
    "instanceIdentificationMethod": "by-instance-id",
    "instances": [
        "i-11111111",
        "i-22222222"
    ],

    "documentName": "AWS-RunShellScript",
    "commandParameters": [
        {
            "parameterName": "commands",
            "values": [
                "yum update"
            ]
        }
    ],

    "timeoutInSeconds": 900
}
```


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