[ aws . ssm ]



Retrieves the history of all changes to a parameter.

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.

get-parameter-history is a paginated operation. Multiple API calls may be issued in order to retrieve the entire data set of results. You can disable pagination by providing the --no-paginate argument. When using --output text and the --query argument on a paginated response, the --query argument must extract data from the results of the following query expressions: Parameters


--name <value>
[--with-decryption | --no-with-decryption]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]


--name (string)

The name of the parameter for which you want to review history.

--with-decryption | --no-with-decryption (boolean)

Return decrypted values for secure string parameters. This flag is ignored for String and StringList parameter types.

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command’s output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See ‘aws help’ for descriptions of global parameters.


To get a value history for a parameter

The following get-parameter-history example lists the history of changes for the specified parameter, including its value.

aws ssm get-parameter-history \
    --name "MyStringParameter"


    "Parameters": [
            "Name": "MyStringParameter",
            "Type": "String",
            "LastModifiedDate": 1582154711.976,
            "LastModifiedUser": "arn:aws:iam::111222333444:user/Mary-Major",
            "Description": "This is the first version of my String parameter",
            "Value": "Veni",
            "Version": 1,
            "Labels": [],
            "Tier": "Standard",
            "Policies": []
            "Name": "MyStringParameter",
            "Type": "String",
            "LastModifiedDate": 1582156093.471,
            "LastModifiedUser": "arn:aws:iam::111222333444:user/Mary-Major",
            "Description": "This is the second version of my String parameter",
            "Value": "Vidi",
            "Version": 2,
            "Labels": [],
            "Tier": "Standard",
            "Policies": []
            "Name": "MyStringParameter",
            "Type": "String",
            "LastModifiedDate": 1582156117.545,
            "LastModifiedUser": "arn:aws:iam::111222333444:user/Mary-Major",
            "Description": "This is the third version of my String parameter",
            "Value": "Vici",
            "Version": 3,
            "Labels": [],
            "Tier": "Standard",
            "Policies": []

For more information, see Working with parameter versions in the AWS Systems Manager User Guide.


Parameters -> (list)

A list of parameters returned by the request.


Information about parameter usage.

Name -> (string)

The name of the parameter.

Type -> (string)

The type of parameter used.

KeyId -> (string)

The ID of the query key used for this parameter.

LastModifiedDate -> (timestamp)

Date the parameter was last changed or updated.

LastModifiedUser -> (string)

Amazon Resource Name (ARN) of the AWS user who last changed the parameter.

Description -> (string)

Information about the parameter.

Value -> (string)

The parameter value.

AllowedPattern -> (string)

Parameter names can include the following letters and symbols.


Version -> (long)

The parameter version.

Labels -> (list)

Labels assigned to the parameter version.


Tier -> (string)

The parameter tier.

Policies -> (list)

Information about the policies assigned to a parameter.

Assigning parameter policies in the AWS Systems Manager User Guide .


One or more policies assigned to a parameter.

PolicyText -> (string)

The JSON text of the policy.

PolicyType -> (string)

The type of policy. Parameter Store supports the following policy types: Expiration, ExpirationNotification, and NoChangeNotification.

PolicyStatus -> (string)

The status of the policy. Policies report the following statuses: Pending (the policy has not been enforced or applied yet), Finished (the policy was applied), Failed (the policy was not applied), or InProgress (the policy is being applied now).

DataType -> (string)

The data type of the parameter, such as text or aws:ec2:image . The default is text .

NextToken -> (string)

The token to use when requesting the next set of items. If there are no additional items to return, the string is empty.