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

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

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

If your grep supports -R, do:

grep -R 'string' dir/

If not, then use find:

find dir/ -type f -exec grep -H 'string' {} +

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