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The following command retrieves the bucket policy for a bucket named ``amzn-s3-demo-bucket``::
aws s3api get-bucket-policy --bucket amzn-s3-demo-bucket
Output::
{
"Policy": "{\"Version\":\"2008-10-17\",\"Statement\":[{\"Sid\":\"\",\"Effect\":\"Allow\",\"Principal\":\"*\",\"Action\":\"s3:GetObject\",\"Resource\":\"arn:aws:s3:::amzn-s3-demo-bucket/*\"},{\"Sid\":\"\",\"Effect\":\"Deny\",\"Principal\":\"*\",\"Action\":\"s3:GetObject\",\"Resource\":\"arn:aws:s3:::amzn-s3-demo-bucket/secret/*\"}]}"
}
Get and put a bucket policy
---------------------------
The following example shows how you can download an Amazon S3 bucket policy,
make modifications to the file, and then use ``put-bucket-policy`` to
apply the modified bucket policy. To download the bucket policy to a file,
you can run::
aws s3api get-bucket-policy --bucket amzn-s3-demo-bucket --query Policy --output text > policy.json
You can then modify the ``policy.json`` file as needed. Finally you can apply
this modified policy back to the S3 bucket by running::
aws s3api put-bucket-policy --bucket amzn-s3-demo-bucket --policy file://policy.json