[PerlChina] Re: CN Perl Advent Day 6: ack

看了第一大理由，一激动差点把 grep 给删了，仔细看看大文件还得用 grep：
http://search.cpan.org/~petdance/ack-1.90/ack-base#WHEN_TO_USE_GREP

WHEN TO USE GREP

ack trumps grep as an everyday tool 99% of the time, but don't throw
grep away, because there are times you'll still need it.

E.g., searching through huge files looking for regexes that can be
expressed with grep syntax should be quicker with grep.

If your script or parent program uses grep --quiet or --silent or
needs exit 2 on IO error, use grep.

2009/12/6 Fayland Lam <fayland@gmail.com>
>
> http://perlchina.org/advent/2009/ack.html
>
> =for advent_year 2009
>
> =for advent_day 6
>
> =for advent_title ack
>
> =for advent_author Fayland Lam
>
> A<ack> 类似 grep, 能做 99% grep 做的事情。
>
> =begin pre
>
> [fayland@perl .cpan]$ ack --perl XXX .
> build/Config-INI-MVP-0.024-ntIMhU/inc/Module/Install/Makefile.pm
> 241: # XXX - This is currently unused; not sure if it breaks other MM-users
>
> build/Config-INI-MVP-0.024-ntIMhU/lib/Config/INI/MVP/Reader.pm
> 96:# XXX: These should be attributes with builders and blah blah blah,
> but I just
>
> build/Pod-Weaver-3.093130-CWMqF_/lib/Pod/Weaver/Plugin/EnsurePod5.pm
> 18: # XXX: This is really stupid. -- rjbs, 2009-10-24
>
> build/Pod-Weaver-3.093130-CWMqF_/t/ini-config.t
> 80:# XXX: This test is extremely risky as things change upstream.
>
> build/Pod-Weaver-3.093130-CWMqF_/t/basic.t
> 80:# XXX: This test is extremely risky as things change upstream.
>
> build/Email-Sender-0.093110-x5M__z/lib/Email/Sender/Transport/Test.pm
> 72: # XXX: We must report partial success (failures) if applicable.
>
> =end pre
>
> A<http://betterthangrep.com/>
>
> 十大理由使用 ack:
>
> * 快速。比 grep 快多了
>
> * 使用 Perl 编写
>
> * 能在 Windows 下运行
>
> * 默认忽略您不要的东西。比如 .svn .git 目录，vim 的临时文件等。
>
> * 支持文件类型，比如 --perl 或者 --nohtml 等，无需 find -type
>
> * 可以得到某种类型文件的列表，比如得到 perl 文件的列表
>
> =begin pre
>
> $ ack -f --perl > all-perl-files
>
> =end pre
>
> * 语法加亮。
>
> * 使用我们最熟悉的 Perl 正则
>
> * 支持大部分 grep 参数如 -w -c -l
>
> * ack 只有三个字符，grep 有四个，而 grep -r 是六个。
>
> 最后，它能合并到流行的编辑器中，如 Vim, Emacs 和 TextMate. 参考
> A<http://search.cpan.org/perldoc?ack#ACK_&_OTHER_TOOLS>
>
> 而 Perl 编辑器 A<Padre> 就是使用 ack 来做文件搜索。
>
> 最后，感谢牛人 Andy Lester (petdance) 给我们带来了 ack.
>
> 谢谢。
>
> --
> Fayland Lam // http://www.fayland.org/
>
> >

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