test_example_bash_operator.py

#
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
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from __future__ import annotations

import datetime

from airflow.models.dag import DAG
from airflow.operators.bash import BashOperator
from airflow.operators.empty import EmptyOperator

dag = DAG(
    dag_id="test_example_bash_operator",
    default_args={"owner": "airflow", "retries": 3, "start_date": datetime.datetime(2022, 1, 1)},
    schedule="0 0 * * *",
    dagrun_timeout=datetime.timedelta(minutes=60),
)

cmd = "ls -l"
run_this_last = EmptyOperator(task_id="run_this_last", dag=dag)

run_this = BashOperator(task_id="run_after_loop", bash_command="echo 1", dag=dag)
run_this.set_downstream(run_this_last)

for i in range(3):
    task = BashOperator(
        task_id=f"runme_{i}", bash_command='echo "{{ task_instance_key_str }}" && sleep 1', dag=dag
    )
    task.set_downstream(run_this)

task = BashOperator(
    task_id="also_run_this", bash_command='echo "run_id={{ run_id }} | dag_run={{ dag_run }}"', dag=dag
)
task.set_downstream(run_this_last)

if __name__ == "__main__":
    dag.cli()