Filter out noise and search whole trees

Goal

The folder testdata/logs holds several log files in nested folders. Print every line that contains error or warn, except lines that also contain debug, sorted alphabetically.

Example

If testdata/logs/a.log held:

info fine
warn disk
debug warn ignored

your script prints (note the file name grep -r adds in front):

testdata/logs/a.log:warn disk

Rules

• Edit answer.sh. Search the whole testdata/logs folder, including every sub-folder.
• Keep the file-name prefix that grep -r prints. Do not remove it.
• End your pipeline with sort so the lines come out in a fixed order.
• Matching is case-sensitive: the words are lower-case in these logs.

What you'll practice

grep -r, grep -E, grep -v, pipes, and sort.

Run it

gonomicon fetch week-1/02-03-grep-invert-recursive-extended
cd 02-03-grep-invert-recursive-extended
gonomicon test
gonomicon submit

Hints

1. grep -r searches every file inside a folder. -E lets you write error|warn.
2. Chain two greps with a pipe: the first finds, the second removes lines with grep -v.
3. Finish with | sort so the output order never changes.