How to control GPIO?

Using jetson xavier nx, jetpack5.1.1, ubuntu20.04.
I use commands in the terminal to control the IO port to output a high level, but when I use a multimeter to measure the voltage it shows 0. What is the problem? I tested the seventh pin IO number 436 and the fortieth pin IO number 446 and there was no voltage output.
微信截图_20240523170723
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Please don’t give screenshots. Give text logs please.
You even overlapped the two images…

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