How to check with AWS cli if file exists in S3

Today i was working on adding history trends feature from Allure report to our Integration API Tests Framework and in order to do that i need to implement simple algorithm:

1. Check if folder for specific group of tests history exists
2. If it exists, copy this folder to allure-results folder
3. Generate Report with ./gradlew allureReport command
4. Sync new history folder with S3 bucket

Seems easy, right ? They only problem i faced was that S3 doesn't provide you with an easy option to check if object in bucket exists. So, after some googling and try outs i managed to create this simple script :

totalFoundObjects=$(aws s3 ls s3://${S3_BUCKET_NAME}/${PATH_TO_FOLDER} --recursive --summarize | grep "Total Objects: " | sed 's/[^0-9]*//g')
if [ "$totalFoundObjects" -eq "0" ]; then
   echo "There are no files found"
else
  echo "I have found $totalFoundObjects"
fi

Hope this will be helpful for you as well.