ack - better than grep一个比Grep更好用的工具
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.
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