Some of the CLI libraries that can be used to access s3 buckets are described below:

• rclone (works for public and private buckets after configuration)

  Run the following command with your 'bucket_name' after configuring a remote s3 with the endpoint (rclone configure and follow the interactive configuration for a new remote)

  rclone ls s3://bucket_name/

  
  

• s3cmd 

  It works only for private buckets

  Run the following command with your 'bucket_name' after configuring the remote to use (s3cmd --configure and follow the interactive configuration for a new remote)

  s3cmd ls s3://bucket_name/

  
  

• awscli

  Run the following command with your 'bucket_name' after configuring the remote for a private bucket (aws configure  and follow the interactive configuration for a new remote):

  aws s3 ls --endpoint-url s3_endpoint_url s3://bucket_name/

  Run the following command with your 'bucket_name' for a public bucket:

  aws s3 ls --endpoint-url s3_endpoint_url s3://bucket_name/ --no-sign-request