add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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md5 043c4455172d2ec9cfb87385aa71dedc  nodelet-core-1.9.14.tar.gz
md5 4bde1fae8921cbe1b895e4e73f8fa94f  nodelet-core-1.9.16.tar.gz