How to get aws lambda function name at CLI?

Question

I can get the details with

$ aws lambda get-function --function-name random_number
{
    "Configuration": {
        "FunctionName": "random_number",
        "FunctionArn": "arn:aws:lambda:us-east-2:193693970645:function:random_number",
        "Runtime": "ruby2.5",
        "Role": "arn:aws:iam::193693970645:role/service-role/random_number-role-8cy8a1a7",
        ...

But how can get just a couple of fields like function name ?

I tried:

$ aws lambda get-function --function-name random_number --query "Configuration[*].[FunctionName]"

but I get null

Dunedan · Accepted Answer · 2019-10-20 10:57:43Z

2

Your overall approach is correct, you just need to adjust the query:

$ aws lambda get-function --function-name random_number \
      --query "Configuration.FunctionName" --output text

I also added a parameter to convert the result to text, which makes processing a bit easier.

answered Oct 20, 2019 at 10:57

Dunedan

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Dudi Boy · Accepted Answer · 2019-10-20 14:26:07Z

1

Here is a simple awk (standard Linux gnu awk) script that does the trick: Extract the values of quoted field #3, only for line having /FunctionName/.

awk 'BEGIN {FPAT="\"[^\"]+"}/FunctionName/{print substr($3,2)}'

Piped with your initial command:

$ aws lambda get-function --function-name random_number | awk 'BEGIN {FPAT="\"[^\"]+"}/FunctionName/{print substr($3,2)}'

answered Oct 20, 2019 at 14:26

Dudi Boy

1

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Amit Baranes · Accepted Answer · 2019-10-20 10:41:46Z

0

One way to achieve that is by using jq. therefore, the output must be JSON.

From the docs :

jq is like sed for JSON data - you can use it to slice and filter and map and transform structured data with the same ease that sed, awk, grep and friends let you play with text.

Usage example :

aws lambda get-function --function-name test --output json | jq -r '.Configuration.FunctionName'

answered Oct 20, 2019 at 10:41

Amit Baranes

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Michael Durrant · Accepted Answer · 2019-10-20 10:39:12Z

-2

Use get-function-configuration as in the following:

aws lambda get-function-configuration --function-name MyFunction --query "[FunctionName]"

answered Oct 20, 2019 at 10:39

Michael Durrant

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