/opt/metrics-collector/lib/collectd/usr/bin/collectdctl: invalid option -- '-'
Usage: /opt/metrics-collector/lib/collectd/usr/bin/collectdctl [options] <command> [cmd options]

Available options:
  -s       Path to collectd's UNIX socket.
           Default: /var/run/collectd-unixsock

  -h       Display this help and exit.

Available commands:

 * getval <identifier>
 * flush [timeout=<seconds>] [plugin=<name>] [identifier=<id>]
 * listval
 * putval <identifier> [interval=<seconds>] <value-list(s)>

Identifiers:

An identifier has the following format:

  [<hostname>/]<plugin>[-<plugin_instance>]/<type>[-<type_instance>]

Hostname defaults to the local hostname if omitted (e.g., uptime/uptime).
No error is returned if the specified identifier does not exist.

collectd 0.1.7, http://collectd.org/
by Florian octo Forster <octo@collectd.org>
for contributions see `AUTHORS'