Find code style errors in modules in the subdirectory

gistfile1.sh

find . -type d -d 1 -exec phpcs --standard=Drupal --extensions='php,module,inc,install,test,profile,theme,js,css,info,txt' --report-file={}_new.txt {} \;
# typical output:
# mani:contrib-patched greggles$ ls -lS *.txt
# -rw-r--r--  1 greggles  staff  10970 May  1 15:21 password_policy_style_issues.txt
# -rw-r--r--  1 greggles  staff   4887 May  1 15:21 code_coverage_style_issues.txt
# -rw-r--r--  1 greggles  staff   2681 May  1 15:21 quantcast_style_issues.txt
# mani:contrib-patched greggles$

This assumes you've installed the coder module https://www.drupal.org/project/coder

Of course the linter (phpcs ...) could be swapped if you use JavaScript or whatevs.