launchd

A collection of macOS .plist files to automate background tasks

These files may be placed into one of three locations, with the following results:

Location	When Loaded	For Whom	Ownership	Permissions	Controlled by
/Library/LaunchDaemons	at startup	everyone	root:wheel	644	sudo launchctl
/Library/LaunchAgents	at login	everyone	root:wheel	644	launchctl
~/Library/LaunchAgents	at login	specific user	user:staff	644	launchctl

See launchd.info for general syntax, but also refer to man launchd.plist for the macOS-specific implementation, which is a subset in many respects.

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org.tuxfamily.miniupnp.upnpc.plist

Opens a UPnP port forward from public port 50122 to local port 22 for SSH. Once loaded, it will attempt to run every 5 minutes until successful, and then once every 6 hours thereafter. (If loaded at boot time, the first attempt will likely occur before the network is initialized, causing it to fail.) Output is sent to /tmp/org.tuxfamily.miniupnp.upnpc.stdout and /tmp/org.tuxfamily.miniupnp.upnpc.stderr.

Requires the miniupnpc UPnP client, available via Homebrew:

$ brew install miniupnpc

To bring down the UPnP port forwarding, first unload the daemon and then remove the port forward:

$ <sudo> launchctl unload <path/>org.tuxfamily.miniupnp.upnpc.plist && upnpc -d 50122 tcp