Ceph » rgw

root@node13:~# radosgw_admin 
 ** WARNING: Ceph is still under heavy development, and is only suitable for **
 **          testing and review.  Do not trust it with important data.       **
usage: rgw_admin <--user-gen | --user-modify | --read-policy | --list-buckets > [options...]
options:
   --uid=<id> (S3 uid)
   --auth_uid=<auid> (librados uid)
   --key=<key>
   --email=<email>
   --display-name=<name>
   --bucket=<bucket>
   --object=<object>
   -c ceph.conf or --conf=ceph.conf
        get options from given conf file
root@node13:~#

It reports:

usage: rgw_admin

While to command is radosgw_admin