I'm trying to invoke a lambda on AWS using CLI:
aws lambda invoke --function-name GetErrorLambda --payload '{"body":"{\"Id\":[\"321\",\"123\"]}"}' \output.
I would like to know if there's a way to print the output on the cli instead of create a file.
Thanks in advance.
stdout and stderr are basically files so can be used for arguments that expect one
aws lambda invoke --function-name GetErrorLambda --payload '{"body":"{\"Id\":[\"321\",\"123\"]}"}' /dev/stdout
though in this case the rest of the commands output will overlap with it, so probably better to cat it later anyways
cli_binary_format=raw-in-base64-out ~/.aws/config . docs.aws.amazon.com/cli/latest/userguide/…It's not possible to output directly to the terminal after invoking a lambda function. This is likely by design as the output could easily be greater than the buffer size for a window.
A simple workaround would be to simply 'cat' out the contents of the output file following the cli command like so:
aws lambda invoke --function-name GetErrorLambda --payload '{"body":"{\"Id\":[\"321\",\"123\"]}"}' \output. && cat outputFileName.txt
I use following command:
aws lambda invoke --function-name name --payload '{...}' /dev/stdout 2>/dev/null
The idea is redirect command output to stderr and the function result to stdout.
You can use your current tty as the outfile, which allows command output to still be redirected:
> aws lambda invoke --function-name name --payload '{}' $(tty) >/dev/null
LAMBDA_OUTPUT
Using /dev/stdout for the outfile sort of works. Issue #1: the command output gets mixed up with it:
> aws lambda invoke --function-name name --payload '{}' /dev/stdout
{ACTUAL_OUTPUT
"StatusCode": 200,
"ExecutedVersion": "$LATEST"
}
Issue #2: If you try to redirect the stdout then you've just directed the lambda result as well. You can at least separate them by piping to cat:
> aws lambda invoke --function-name name --payload '{}' /dev/stdout | cat
ACTUAL_OUTPUT{
"StatusCode": 200,
"ExecutedVersion": "$LATEST"
}
Using a Bourne shell and for systems that support /dev/fd/<n>, you can duplicate stdout to a new file descriptor and use it for aws output:
exec 3>&1; aws lambda invoke --function-name Func /dev/fd/3 >/dev/null
You can also use that with pipeline:
{ exec 3>&1; aws lambda invoke --function-name Func /dev/fd/3 >/dev/null; } | cat
Or with command substitution:
out=$({ exec 3>&1; aws lambda invoke --function-name Func /dev/fd/3 >/dev/null; })
; in the same invocation: aws lambda invoke --function-name Func /dev/fd/3 3>&1 >/dev/nullI would output it to a file and then cat it, but also redirect the regular output so the only thing printed is from the lambda invocation:
aws lambda invoke --function-name GetErrorLambda --payload '{"body":"{\"Id\":[\"321\",\"123\"]}"}' out >>log && cat out
You can also add && echo to the end of it to echo a new line.
