"gcloud compute scp" wrapper to figure out the zone automatically

gscp

function gscp {
    gcloud config list |grep 'Your active'

    for arg in "$@"; do
        if echo "$arg" | grep -q : - ; then
            break
        fi
    done

    INST=$(echo "$arg" | cut -f1 -d:)

    ZONE=$(gcloud compute instances list |grep --colour=none -E "^$INST[[:space:]]" | awk '{print $2}')
    echo zone: $ZONE

    gcloud compute scp --zone=$ZONE "$@"
}

Put this in your path and you'll be able to scp to/from an instance without figuring out its zone in advance:
gscp somefile jody-imageserver-test:
gscp jody-imageserver-test:somefile .

If you use multiple configurations (gcloud config) to deal with more than one project, you'll need to be sure you've selected the correct configuration. This wrapper makes that easier.