Synology service start/stop/status bash script for /usr/local/etc/rc.d/
### servicemgr.sh 1.1 for service [iperf3]
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servicemgr.sh [option] with possible options:
* start : start service iperf3
* stop : stop service iperf3
* status: show status of service iperf3
* install: install this service on your Synology (so it starts upon reboot)