ack is a grep-like utility that allows searching using Perl-like regular expressions instead of the ed-like regular expressions from grep. Note: On Debian systems and derivatives like Ubuntu it's called ack-grep due to a naming conflict with a Kanji-related tool which is named ack, too.

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Using ack to search for regex in a specific file type

Wondering if there's a way to look for something like ack foo "*.scss"
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grin, ack and rak comparison

Having used ack for some time now, I find it much better for my development purposes than grep. But then I've heard about rak and grin. Has anyone used all three of them and can provide a comparison? ...
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PhpStorm and Ack for source code reading

I need tools to browse large amounts of PHP source code and have heared PhpStorm (the source code IDE from JetBrains) and Ack (The Perl5 module from beyondgrep.com) are some of the best tools for the ...
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Breadth-first search with ack or grep

When I search e.g. my home directory with ack (or grep), I normally want to know where I set a specific option. Since most config files are really close to ~ it would considerably speed up ack if I ...