I want to find list of files (under some directory, recursively) in which the string <some_string> is written

what is the开发者_StackOverflow中文版 best way to do this?

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grep -R <some_string> <directory>

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Another option is:

find . -name "*.cpp" | xargs grep some_string

if you want to restrict the search to particular file patterns or types. With find, you can also specify the maximum depth to search.