save command output to a file without timestamp info

Question

If I run this command on my terminal (https://hub.getdbt.com/dbt-labs/codegen/latest/):

dbt run-operation generate_model_yaml --args "{\"model_name\": "bookings"}"          

I get an output that looks like this:

12:53:32  Running with dbt=1.0.1
12:53:34  version: 2

models:
  - name: bookings
    description: ""
    columns:
      - name: booking_id
        description: ""

      - name: masterclient_id
        description: ""

I want to save it to a file. If I do this:

dbt run-operation generate_model_yaml --args "{\"model_name\": "bookings"}"  > test.yml     

this also gets saved to the output:

12:53:32  Running with dbt=1.0.1
12:53:34  

While my desired output is just this:

version: 2

models:
  - name: bookings
    description: ""
    columns:
      - name: booking_id
        description: ""

      - name: masterclient_id
        description: ""

How can I get rid of the extra time stamp info in the beginning and then save the remaining output in a file?

Answer 1

If you're confident that the output is always structured with those exact two timestamps, you can do:

dbt run-operation generate_model_yaml \
  --args "{\"model_name\": \"bookings\"}" \
  | tail -n +2 | sed '1 s/[0-9:]* *//'

tail -n +2 removes the first line. The sed command removes the timestamp and following whitespace from the second (now first) line.

A quick look at the relevant dbt docs yields

3. The YAML for a base model will be logged to the command line

So it doesn't seem that you can instruct dbt directly to output the YAML data without the logging timestamps.