s3curl is a perl client for S3 object storage management. You can download it via git (i.e. git clone https://github.com/UKCloud/s3curl.git).
The script requires the package libdigest-hmac-perl (for Debian) or perl-Digest-HMAC (for CentOS).
...
Finally, you should be able to manage your buckets and objects, e.g.:
fornari@pc-fornari:~/test_s3/s3curl$ xmllint s3curl$ xmllint --format <(perl s3curl.pl --id SwiftCloud -- https://tb-cloud-api-int.cr.cnaf.infn.it:8080 2>/dev/null)
...
</ListAllMyBucketsResult>
fornari@pc-fornari:~/test_s3/s3curl$ s3curl$