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`-r` or `-R` is recursive,

`-n` is line number, and

`-w` stands for match the whole word.

`-l` (lower-case L) can be added to just give the file name of matching files.

Along with these, `--exclude`, `--include`, `--exclude-dir` flags could be used for efficient searching:

This will only search through those files which have .c or .h extensions:

`grep --include=\*.{c,h} -rnw '/path/to/somewhere/' -e "pattern"`

This will exclude searching all the files ending with .o extension:

`grep --exclude=*.o -rnw '/path/to/somewhere/' -e "pattern"`

For directories it's possible to exclude a particular directory(ies) through `--exclude-dir` parameter. For example, this will exclude the dirs dir1/, dir2/ and all of them matching *.dst/:

`grep --exclude-dir={dir1,dir2,*.dst} -rnw '/path/to/somewhere/' -e "pattern"`

This works very well for me, to achieve almost the same purpose like yours.