need a simple guide how to add user and pw to a sudo command (ubuntu)

[Nicnac58th]

The wake from shutdown, works perfectly. The shutdown directs me to this forum but I presume I just don't know where/how to enter the user/pw. Thanks in advance.

"accessory": "NetworkDevice",
"name": "linuxbox",
"mac": "xx:xx:xx:xx:xx:xx",
"host": "###.###.###.###",
"pingInterval": 45,
"wakeGraceTime": 60,
"shutdownGraceTime": 90,
"shutdownCommand": "sudo shutdown -h now --user user%pw",
"_bridge": {
"username": "xx:xx:xx:xx:xx:xx",
"port": XXXXX