find /var/www -type f -exec grep -l '/sync-clients/' {} \;
This will output all files with the specified string. The path in example is /var/www, and string we search for is /sync-clients/
grep -iRl 'text' .
* -i > ignore caps
* -R > recursive
* -l > Display filename instead of text
* 'text' > text to search
* . > location to start in