connect ec2 using terminal
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ssh -i file.pem username@ip-address
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ssh -i "location/ec2-private-key-pair.pem" OS@EnterpublicDNSHERE
eg: ssh-i "my-key.pem" ubuntu@ec2-4-156-168-19.us-east-2.compute.amazonaws.com
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aws ec2-instance-connect send-ssh-public-key \
--instance-id i-1234567890abcdef0 \
--instance-os-user ec2-user \
--availability-zone us-east-2b \
--ssh-public-key file://path/my-rsa-key.pub