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To Search Subdirectories To include all subdirectories in a search, add the -r operator to the grep command. This command prints the matches for all files in the current directory, subdirectories, and the exact path with the filename.
The grep command searches through the file, looking for matches to the pattern specified. To use it type grep , then the pattern we're searching for and finally the name of the file (or files) we're searching in. The output is the three lines in the file that contain the letters 'not'.
Where the -R option tells grep to read all files under each directory, recursively, following symbolic links only if they are on the command line and option -w instructs it to select only those lines containing matches that form whole words, and -e is used to specify the string (pattern) to be searched.
grep -r --include=*.{cc,h} "hello" .
This reads: search recursively (in all sub directories also) for all .cc OR .h files that contain "hello" at this . (current) directory
From another stackoverflow question
You can pass in wildcards in instead of specifying file names or using stdin.
grep hello *.h *.cc
find . -name \*.cc -print0 -or -name \*.h -print0 | xargs -0 grep "hello".
Check the manual pages for find and xargs for details.
To search in current directory recursively:
grep -r 'myString' .
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