Create command to consistently clean up docker things

[Matthew Franglen]

dcleanup () {
    docker rm $(docker ps -aq 2>/dev/null) 2> /dev/null
    docker rm -v $(docker ps --filter status=exited -q 2>/dev/null) 2> /dev/null
    docker rmi $(docker images --filter dangling=true -q 2>/dev/null) 2> /dev/null
}

[matthewfranglen]

Fixed in 7343a12