ack - better than grep一个比Grep更好用的工具

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http://betterthangrep.com/
ack is a tool like grep, optimized for programmers
Designed for programmers with large heterogeneous trees of source code, ack is written purely in portable Perl 5 and takes advantage of the power of Perl's regular expressions.


Top 5 reasons to use ack

Blazing fast
    It's fast because it only searches the stuff it makes sense to search.
Better search
    Searches entire trees by default while ignoring Subversion, Git and other VCS directories and other files that aren't your source code.
Designed for code search
    Where grep is a general text search tool, ack is especially for the programmer searching source code. Common tasks take fewer keystrokes.
Highly portable
    ack is pure Perl, so it easily runs on a Windows installation Perl (like Strawberry Perl) without modifications.
Free and open
    Ack costs nothing. It's 100% free and open source under Artistic License v2.0.