add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed
sha256 c88a5e4af83c5f40dda8455886ac98923a9c33125699742603a88a0253fcc8c5 libedit-20150325-3.1.tar.gz