grep specific filetypes on MAC

Question

I have a Mac OS X snow leopard. I am using the xterm terminal to grep specific string using this command grep -R --color=auto setHeader *.js but when I run this command I get the error saying

grep: \*.js: No such file or directory

So my question is how can I grep for a specific filetype on Mac?

Answer 1

This one works for me on Mac OS 10.8:

grep --include=*.js -r setHeader .

Answer 2

The best way to do that is to combine the find and the grep command:

find . -name "*.js" -exec grep --color=auto setHeader {} \;

Answer 3

grep --include=*.js -R . --color=auto setHeader

Since the example given uses "file type = file extension", this should just work.