How to search for a string inside of multiple files (in nested folder structure)? [duplicate]

Question

Possible Duplicate:
Software for text search in files

I have a python project with nested folder structure

src/
  folder_1
  folder_2
    subfolder_1
    subfolder_2
  folder_3
    subfolder_1
      subsubfolder_1
    subfolder_2
  etc.

I am looking for a piece of code and the project is too big to go through every file manually.

Is there a way to search for a string "mystring" inside all the files located in src or any subfolder of src?

Answer 1

grep -R src/*