How to grep in specific file type

sachin

I want to find a keyword in only php files, How can I do it in linux?

sachin

You can use find command.

-type f :look into files only

-name '*.php' :for file extension php only

-exec :executing grep

find ./ -type f -name '*.php' -exec grep -H --line-number --color "my keyword" {} \;