add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed:
sha256 02c50746b134fa1b1aae41fcc314d7c6f1919b3d48bcdea01bf11769f83f72e8 pixz-1.0.6.tar.xz