Invoke lambda function from AWS cli

Question

I am trying to call the AWS lambda function from cli by shell script. I want to send the current logged user name to lambda function as parameter. This is the code I tried:

 #!/bin/bash
    user=$(whoami)
    echo "=START="
    echo "$user"
    aws lambda invoke --invocation-type RequestResponse --function-name shell_lambda_invoke --region ap-south-1 --log-type Tail --payload '{"bashuser":"${user}", "InstanceId":"'i-0c4869ec747845b99'"}'

Thanks in advance.

Kubator · Accepted Answer · 2018-12-18 09:19:48Z

3

Since Your bash variable is inside single quotes it won't get populated.

Test:

$ echo "${user}"
root

Your sample:

$ echo '{"bashuser":"${user}", "InstanceId":"'i-0c4869ec747845b99'"}'
{"bashuser":"${user}", "InstanceId":"i-0c4869ec747845b99"}

You need to interrupt quoting like this:

$ echo '{"bashuser":"'"${user}"'", "InstanceId":"'i-0c4869ec747845b99'"}'
{"bashuser":"root", "InstanceId":"i-0c4869ec747845b99"}

answered Dec 18, 2018 at 9:19

Kubator

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2 Comments

Vikas Satpute Over a year ago

I want to get the user name in: I tried waht you shared but doesn't work command: aws lambda invoke --invocation-type RequestResponse --function-name shell_lambda_invoke --region ap-south-1 --log-type Tail --payload '{"bashuser":" ' "${user}" ' ", "InstanceId":"'i-0c4869ec747845b99'"}'

Vikas Satpute Over a year ago

the code is working fine when I tried with putty the same code doesn't work with Juicessh application. I am self answering question have look at it and thanks for you help:)

Vikas Satpute · Accepted Answer · 2019-11-06 05:09:31Z

3

To invoke the lambda function using AWS CLI write the following code which works fine: I am sending payload to this function with instance ID and user name as I needed this in lambda if you wan't to send anything other you can send other details as input in payload section.

#!/bin/bash
user=$(whoami)
echo Please Enter the InstanceId
read InstanceId
aws lambda invoke --invocation-type RequestResponse --function-name wu_core_auto_start_stop_lambdainvoke --region us-east-1 --log-type Tail --payload '{"bashuser":"'"${user}"'", "InstanceId":"'"${InstanceId}"'"}' outputfile.txt

edited Nov 6, 2019 at 5:09

answered Dec 19, 2018 at 8:01

Vikas Satpute

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