Grep command for searching for files in linux server

grep.txt

#find files that have certain string 
grep -rnl '/home/directory' -e 'string_you_want_to_search'

#find lines that have certain string 
grep 'string_you_want_to_search' '/file/path'

#find IP Address for Logs in Cloudways Application
find /home/app-directory/logs/php-app.access.log* -type f -exec grep "IP_ADDRESS" {} \;