How to substitute variable value in “docker run” command

问题

I am using a bash script and trying to assign a fingerprint value as below

export FINGERPRINT=D0:19:C5:80:42:66:56:AC:6F  
docker run --rm -i -v /var/run/docker.sock:/var/run/docker.sock --name ucp docker/ucp join --replica --fingerprint $FINGERPRINT

However, bash is not at all substituting the value of $FINGERPRINT

回答1:

Try this:

export FINGERPRINT=D0:19:C5:80:42:66:56:AC:6F
echo `docker run --rm -i -v /var/run/docker.sock:/var/run/docker.sock --name ucp docker/ucp join --replica --fingerprint $FINGERPRINT`

来源：https://stackoverflow.com/questions/36876613/how-to-substitute-variable-value-in-docker-run-command