# Use `AttachNetworkInterface` with a CLI
<a name="example_ec2_AttachNetworkInterface_section"></a>

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

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

**AWS CLI**  
**Example 1: To attach a network interface to an instance**  
The following `attach-network-interface` example attaches the specified network interface to the specified instance.  

```
aws ec2 attach-network-interface \
    --network-interface-id eni-0dc56a8d4640ad10a \
    --instance-id i-1234567890abcdef0 \
    --device-index 1
```
Output:  

```
{
    "AttachmentId": "eni-attach-01a8fc87363f07cf9"
}
```
For more information, see [Elastic network interfaces](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html) in the *Amazon EC2 User Guide*.  
**Example 2: To attach a network interface to an instance with multiple network cards**  
The following `attach-network-interface` example attaches the specified network interface to the specified instance and network card.  

```
aws ec2 attach-network-interface \
    --network-interface-id eni-07483b1897541ad83 \
    --instance-id i-01234567890abcdef \
    --network-card-index 1 \
    --device-index 1
```
Output:  

```
{
    "AttachmentId": "eni-attach-0fbd7ee87a88cd06c"
}
```
For more information, see [Elastic network interfaces](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html) in the *Amazon EC2 User Guide*.  
+  For API details, see [AttachNetworkInterface](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/attach-network-interface.html) in *AWS CLI Command Reference*. 

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

**Tools for PowerShell V4**  
**Example 1: This example attaches the specified network interface to the specified instance.**  

```
Add-EC2NetworkInterface -NetworkInterfaceId eni-12345678 -InstanceId i-1a2b3c4d -DeviceIndex 1
```
**Output:**  

```
eni-attach-1a2b3c4d
```
+  For API details, see [AttachNetworkInterface](https://docs.aws.amazon.com/powershell/v4/reference) in *AWS Tools for PowerShell Cmdlet Reference (V4)*. 

**Tools for PowerShell V5**  
**Example 1: This example attaches the specified network interface to the specified instance.**  

```
Add-EC2NetworkInterface -NetworkInterfaceId eni-12345678 -InstanceId i-1a2b3c4d -DeviceIndex 1
```
**Output:**  

```
eni-attach-1a2b3c4d
```
+  For API details, see [AttachNetworkInterface](https://docs.aws.amazon.com/powershell/v5/reference) in *AWS Tools for PowerShell Cmdlet Reference (V5)*. 

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For a complete list of AWS SDK developer guides and code examples, see [Create Amazon EC2 resources using an AWS SDK](sdk-general-information-section.md). This topic also includes information about getting started and details about previous SDK versions.