add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally calculated
sha256    edc5aa73f43bd6c7d49f2c1d5906a0a68c0b28bc4dfdaf1f2aa5ae4a2449c58e    iostat-2.2.tar.gz