# collectd > System statistics collection daemon. > More information: . - Test the configuration file and then exit: `collectd -t` - Test plugin data collection functionality and then exit: `collectd -T` - Start `collectd`: `collectd` - Specify a custom configuration file location: `collectd -C {{path/to/file}}` - Specify a custom PID file location: `collectd -P {{path/to/file}}` - Don't fork into the background: `collectd -f` - Display help and version: `collectd -h`