以sshd服务为例
启动sshd服务:sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist
停止sshd服务:sudo launchctl unload -w /System/Library/LaunchDaemons/ssh.plist
查看是否启动:sudo launchctl list | grep ssh
成功启动:--------------- 0 com.openssh.sshd