AWS Documentation » AWS Lambda » Developer Guide » Examples of How to Use AWS Lambda » Using AWS Lambda with Custom User Applications » Tutorial: Using AWS Lambda with Custom User Applications » Step 4: Try More CLI Commands (AWS CLI)

Step 4: Try More CLI Commands (AWS CLI)

Step 4.1: List the Lambda Functions in Your Account

In this section, you try AWS Lambda list function operations. Execute the following AWS CLI list-functions command to retrieve a list of functions that you uploaded.

$ aws lambda list-functions \
--max-items 10 \
--profile adminuser

To illustrate the use of pagination, the command specifies the optional --max-items parameter to limit the number of functions returned in the response. For more information, see ListFunctions. The following is an example response.

{
    "Functions": [
        {
            "FunctionName": "helloworld",
            "MemorySize": 128,
            "CodeSize": 412,
            "FunctionArn": "arn:aws:lambda:us-east-1:account-id:function:ProcessKinesisRecords",
            "Handler": "ProcessKinesisRecords.handler",
            "Role": "arn:aws:iam::account-id:role/LambdaExecRole",
            "Timeout": 3,
            "LastModified": "2015-02-22T21:03:01.172+0000",
            "Runtime": "nodejs6.10",
            "Description": ""
        },
        {
            "FunctionName": "ProcessKinesisRecords",
            "MemorySize": 128,
            "CodeSize": 412,
            "FunctionArn": "arn:aws:lambda:us-east-1:account-id:function:ProcessKinesisRecords",
            "Handler": "ProcessKinesisRecords.handler",
            "Role": "arn:aws:iam::account-id:role/lambda-execute-test-kinesis",
            "Timeout": 3,
            "LastModified": "2015-02-22T21:03:01.172+0000",
            "Runtime": "nodejs6.10",
            "Description": ""
        },
        ...
      ],
       "NextMarker": null

} 

In response, Lambda returns a list of up to 10 functions. If there are more functions you can retrieve, NextMarker provides a marker you can use in the next list-functions request; otherwise, the value is null. The following list-functions AWS CLI command is an example that shows the --next-marker parameter.

$ aws lambda list-functions \
--max-items 10 \
--marker value-of-NextMarker-from-previous-response \
--profile adminuser

Step 4.2: Get Metadata and a URL to Download Previously Uploaded Lambda Function Deployment Packages

The Lambda CLI get-function command returns Lambda function metadata and a presigned URL that you can use to download the function's .zip file (deployment package) that you uploaded to create the function. For more information, see GetFunction.

$ aws lambda get-function \
--function-name helloworld \
--region region \
--profile adminuser

The following is an example response.

{
    "Code": {
        "RepositoryType": "S3",
        "Location": "pre-signed-url"
    },
   "Configuration": {
        "FunctionName": "helloworld",
        "MemorySize": 128,
        "CodeSize": 287,
        "FunctionArn": "arn:aws:lambda:us-west-2:account-id:function:helloworld",
        "Handler": "helloworld.handler",
        "Role": "arn:aws:iam::account-id:role/LambdaExecRole",
        "Timeout": 3,
        "LastModified": "2015-04-07T22:02:58.854+0000",
        "Runtime": "nodejs6.10",
        "Description": ""
    }

}

If you want the function configuration information only (not the presigned URL), you can use the Lambda CLI get-function-configuration command.

$ aws lambda get-function-configuration \
 --function-name helloworld \
 --region region \
--profile adminuser

Next Step

Step 5: Delete the Lambda Function and IAM Role (AWS CLI)