Find all files contains a string -Easyway through Terminal

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.