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Checking your Network Interface Card is connected or not

 

Check your Network Interface Card

cat /sys/class/net/eth0/carrier
or, 
cat /sys/class/net/eth0/operstate

if the result is 0 or down, it means your NIC to cable is not connected.

if the result is 1 or up, it means your NIC to cable is connected.

 

 

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