How to look for a file with a specific expression in UNIX recursively?

How can I find the list of files that includes a specific expression?

Let's say I am in /opt and I want to find the files that include "insert Ahd"

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grep -r "insert Ahd" /opt

Kent OlsenDBACommented:

Easy enough.  :)

  grep -l  "insert Ahd"  *

Bryan ButlerCommented:
The -r makes it recurse through sub-folders.
The -l makes it print the filenames and not the lines.

grep -lr "insert Ahd" *

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Unix OS

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