Run the below command from AWS CLI to print only the names of objects in an s3 bucket where bucketname is the name of the bucket.
aws s3 ls s3://bucketname/ | awk '{print $4}'
To print names of objects within a folder under s3 bucket, use the below command where prefix is a folder within your s3 bucket.
aws s3 ls s3://bucketname/prefix/ | awk '{print $4}'
Use the below command to print names of all the objects in an s3 bucket and all it’s prefixes(recursively).
s3cmd ls -r s3://bucketname/ | awk '{print $4}'
You can redirect output of any of the above commands to a file as shown below:
aws s3 ls s3://bucketname/prefix/ | awk '{print $4}'> listfile