add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# From https://www.kernel.org/pub/software/utils/pciutils/sha256sums.asc
sha256    1d62f8fa192f90e61c35a6fc15ff3cb9a7a792f782407acc42ef67817c5939f5    pciutils-3.5.5.tar.xz