add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# /etc/nsswitch.conf
 
passwd:         files
group:          files
shadow:         files
 
hosts:          files dns
networks:       files dns
 
protocols:      files
services:       files
ethers:         files
rpc:            files