How to grep a string or a text in a directory and all its subdirectories files in LINUX

If your grep supports -R do grep -R string dir If not then use find find dir -type f -exec grep -H string

[linux] How to grep a string in a directory and all its subdirectories?

grep -r -e string directory

-r is for recursive; -e is optional but its argument specifies the regex to search for. Interestingly, POSIX grep is not required to support -r (or -R), but ~~I'm practically certain that System V grep did, so~~ in practice they (almost) all do. Some versions of grep support -R as well as (or conceivably instead of) -r; AFAICT, it means the same thing.

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