add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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root::0:0:root:/home/root:/bin/sh
pseudopasswd:*:1:1:this-is-the-pseudo-passwd:/nonexistent:/bin/sh
nobody:*:65534:65534:nobody:/nonexistent:/bin/sh