Grep a string recursively in all .htaccess files

Question

How can I grep for a certain string recursively in all .htaccess files?

grep -r -n -H -I 'string' .htaccess

doesn't seem to work.

I'm on a GNU Linux system.

Answer 1

cd to a folder before the folders that store the htaccess

$find . -name ".htaccess" -exec grep -r -n -H -I 'string' {} \;

Answer 2

Use the --include option:

grep -rnHI 'pattern' --include=.htaccess .