One great tool also is Ack (apt-get install ack-greg) whish is kind of grep on steroids designed to search source files It ignore files in .git/.svn directorie

One great tool also is Ack (apt-get install ack-greg) whish is kind of grep on steroids designed to search source files It ignore files in .git/.svn directories, you can define your own file type filters in its config file .ackrc