linux - grep, but only certain file extensions

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I am working on writing
some scripts to grep certain directories, but these directories
contain all sorts of file types.

I want to
grep just .h and
.cpp for now, but maybe a few others in the
future.

So far I
have:

{ grep -r -i CP_Image
            ~/path1/;

grep -r -i CP_Image
            ~/path2/;


grep -r -i CP_Image
            ~/path3/;

grep -r -i CP_Image ~/path4/;

grep
            -r -i CP_Image ~/path5/;} 

| mailx -s GREP
            email@domain.com

Can
anyone show me how I would now add just the specific file
extensions?

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class="normal">Answer

Just use
the --include parameter, like
this:

grep -r -i --include \*.h
            --include \*.cpp CP_Image ~/path[12345] | mailx -s GREP
            email@domain.com

that
should do what you want.

Syntax
notes:

• -r
  - search recursively


• -i -
  case-insensitive
  search


• --include=\*.${file_extension}
  - search files that match the extension(s) or file pattern
  only