There are more AWS SDK examples available in the [AWS Doc SDK Examples](https://github.com/awsdocs/aws-doc-sdk-examples) GitHub repo.

# Use `GetParameterHistory` with a CLI
<a name="ssm_example_ssm_GetParameterHistory_section"></a>

The following code examples show how to use `GetParameterHistory`.

------
#### [ CLI ]

**AWS CLI**  
**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"
```
Output:  

```
{
    "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](https://docs.aws.amazon.com/systems-manager/latest/userguide/sysman-paramstore-versions.html) in the *AWS Systems Manager User Guide*.  
+  For API details, see [GetParameterHistory](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ssm/get-parameter-history.html) in *AWS CLI Command Reference*. 

------
#### [ PowerShell ]

**Tools for PowerShell V4**  
**Example 1: This example lists the value history for a parameter.**  

```
Get-SSMParameterHistory -Name "Welcome"
```
**Output:**  

```
Description      :
KeyId            :
LastModifiedDate : 3/3/2017 6:55:25 PM
LastModifiedUser : arn:aws:iam::123456789012:user/admin
Name             : Welcome
Type             : String
Value            : helloWorld
```
+  For API details, see [GetParameterHistory](https://docs.aws.amazon.com/powershell/v4/reference) in *AWS Tools for PowerShell Cmdlet Reference (V4)*. 

**Tools for PowerShell V5**  
**Example 1: This example lists the value history for a parameter.**  

```
Get-SSMParameterHistory -Name "Welcome"
```
**Output:**  

```
Description      :
KeyId            :
LastModifiedDate : 3/3/2017 6:55:25 PM
LastModifiedUser : arn:aws:iam::123456789012:user/admin
Name             : Welcome
Type             : String
Value            : helloWorld
```
+  For API details, see [GetParameterHistory](https://docs.aws.amazon.com/powershell/v5/reference) in *AWS Tools for PowerShell Cmdlet Reference (V5)*. 

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