[Ballas]

Well, you can have the same functionality with find if you want it:

find -type f -exec grep -Hn "_content_" {} \;

[rovr138]

  grep -RHn "_content_" .

[dotancohen]

Though I much prefer this solution, the GP solution is better when there are non-text documents in the directory tree. Find is nice and that you can narrow it down by file name or file extension, without relying on bash globs.