grep -rnw '/path/to/somewhere/' -e 'pattern'
Eg:
grep -rnw '/var/www/sarankumar.xyz/htdocs/' -e 'google.com'
- -r or -R is recursive,
- -n is line number, and
- -w stands for match the whole word.
- -l (lower-case L) can be added to just give the file name of matching files.