Start:

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sudo dscl . -create /Users/ftp
sudo dscl . -create /Users/ftp NFSHomeDirectory /Users/labrown/Public/ftp
sudo launchctl load -w /System/Library/LaunchDaemons/ftp.plist

Stop:

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sudo launchctl unload -w /System/Library/LaunchDaemons/ftp.plist
sudo dscl . -delete /Users/ftp