from airflow import DAG
from airflow.operators.dummy_operator import DummyOperator
from airflow.operators.bash_operator import BashOperator
from datetime import datetime, timedelta

with DAG(dag_id='bash_dag', schedule_interval="@once", start_date=datetime(2020, 1, 1), catchup=False) as dag:

# Task 1
dummy_task = DummyOperator(task_id='dummy_task')

# Task 2
bash_task = BashOperator(task_id='bash_task', bash_command="/usr/local/airflow/dags/command.sh ", xcom_push=True)

dummy_task >> bash_task