Hi (again) Yogesh:
Upon rereading, I noticed that you say that the "...find command finds the string in /interfaces/eu3/hmsl dir as well."
Including the '-type f' as I suggested should eliminate finding symbolic links if that is indeed a problem.
Too, if you do not want to chase symbolic links, add "! -follow" to your 'find' expressions.
Adding '-xdev' is extremely important if/when you do not want to cross mountpoints; most notably if/when you are searching the root ('/') directory.
Regards!
...JRF...