grep [-e|--regexp] [-k|--keys] [-v|--values] SEARCH PATH
grep recursively searches the given SEARCH substring in key and value pairs of given PATH. To treat the search string as a regular-expression, add -e or --regexp to the end of the command. By default, both keys and values will be searched. If you would like to limit the search, you may add -k or --keys to the end of the command to search only a path's keys, or -v or --values to search only a path's values.
If you are looking for copies or just trying to find the path to a certain string, this command might come in handy.