Shell script to poll successful completion of Dataflow job

poll_dataflow_status.sh

#!/bin/sh
JOB_ID=$1
SLEEP_TIME=10
echo "Polling status for Dataflow job: ${JOB_ID}"

check_job_status() {
    echo "${JOB_STATUS}" | grep "JOB_STATE_DONE\|JOB_STATE_CANCELLED\|JOB_STATE_FAILED\|JOB_STATE_DRAINED\|^$" > /dev/null
    GREP_RETURN_CODE=$?
    if [ ${GREP_RETURN_CODE} -eq 0 ]
    then
        printf "Dataflow job complete!\\r\\n"
        exit 1
    fi
}

while [ true ]
do
    JOB_STATUS=$(gcloud --format json dataflow jobs describe $JOB_ID | jq -r '.currentState')
    check_job_status
    printf "\\r$JOB_STATUS"
    for i in $(seq 1 $SLEEP_TIME); do printf "."; sleep 1; done
done