add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed:
sha256  354237d400dc46af887cb3ffa4ed1f2c371f5b8bee8be046a683a4ac9db4f9c5  tn5250-0.17.4.tar.gz