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Insert a newline after match in files of specific name under some subdirectories?

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# 1  
Old 10-30-2016
Insert a newline after match in files of specific name under some subdirectories?
Hi

I'd like to add the newline:

\tuser: nobody", or "<TAB>user: nobody

to all files named:

Code:
docker-compose.yml

in subfolders of pwd with names beginning with 10-20.

Within these files, I'd like to find the line (there'll only be one) containing:

Code:
command: celery worker

NOTE: As far as I know, each of these lines will actually contain:
command: celery worker -l info -A snakeeyes.blueprints.contact.tasks, but I haven't checked each file, some may differ so the above search pattern seemed reasonable.
And append on a new line directly below the matching line, the aforementioned string, either:

\tuser: nobody", or "<TAB>user: nobody

If anyone knows how to do this, a (if possible, verbosely annotated) answer would be greatly appreciated!

---
Not Important:

I've been trying to figure this out by myself - I had been reading Sed & Awk by Dougherty & Robbins earlier this year, but I haven't gotten very far, and there's nothing in my notes for this sort of case... here's what I had come up with thus far after searching line and combining different things I read:

Code:
find . -name docker-compose.yml -exec sed -i "command: celery worker/ a\\\tuser: nobody" {} \;

Mostly including this not as a starting point, but so you can laugh at it (it mangled the files)
Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!
Last edited by duncanbetts; 11-01-2016 at 01:25 PM.. Reason: Added CODE tags.
# 2  
Old 10-30-2016
Try
Code:
find . -name docker-compose.yml -exec sed -i "/command: celery worker/ a\\\tuser: nobody" {} \;

This User Gave Thanks to RudiC For This Post:
duncanbetts
# 3  
Old 10-30-2016
Thanks RudiC, that did it Smilie.

Turned out I needed spaces for YAML.

Code:
find . -name docker-compose.yml -exec sed -i "/command: celery worker/ a\ \ \ \ user: nobody" {} \;

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