Ack is an useful tool for programmers to search for text in source files. If you use Vim as your editor, you may want to use Ack to search and directly jump to the files and lines containing the text. The Ack plugin for Vim does exactly this!
I like to clone its repository and use Pathogen to install it:
$ git clone https://github.com/mileszs/ack.vim
To search for a text string
foobar, try the command
:Ack foobar. The search results are shown in a new split window. Use jk to scroll the results and press Enter on any entry to jump into that file and line containing the search string.
Tried with: Vim 7.4 and Ubuntu 14.04