Grabbing connection and link status with nmcli

I've not used nmcli in any of its more intricate ways, but are there some
easily-parsed commands which will allow me to tell whether an Ethernet
interface is up (a la 'nmcli conn up/down') AND the cable is connected
('link/carrier state')?
I can grab some hints of the latter with /sys/class/net/eth0/carrier, but
would prefer an approach that is harmonised through nmcli. Are there a
couple of sub-commands that can be used rather than parsing the full 'nmcli
dev show' output? e.g. to output a couple of specific fields.


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