add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed:
sha256  2164592a67b467e5b20fdcdaf5bd4c50685199067391c6fcad4fa5521c9b4dd7  fdk-aac-0.1.5.tar.gz