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aws s3 cp "dist/myfile" "s3://my-bucket/production/myfile"

It always copies myfile to s3 - I would like to copy file ONLY if it does no exist, throw error otherwise. How I can do it? Or at least how I can use awscli to check if file exists?

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You can use the following command to check if a file exists or not:

aws s3 ls s3://bucket/file_name.txt | wc -l

If this command returns nothing that means the file that you searched for does not exist.

Use the following command to copy a file if it does not exist:

aws s3 sync . s3://bucket/ --exclude '*' --include 'file_name.txt'

Learn more about AWS by going through AWS course and master this trending technology.

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