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+#+BEGIN_QUOTE
+ Ack is designed as a replacement for 99% of the uses of grep.
+#+END_QUOTE
+
+[[https://metacpan.org/module/App::Ack][Ack]] is a really nice tool for
+searching your source code. It's faster than grep because he already
+knows what you want : searching your sources files :)
+
+By default it will not search in SCM files (.git, .svn, ...), backups
+files (source.pl~, source.pl.bak, ...). You can specify what kind of
+files you want (=--perl=, =--cc=, ...), make it match some regex with
+=--match=, ...
+
+And you can set some defaults configuration in a .ackrc file ! Mine
+looks like this:
+
+#+BEGIN_SRC sh
+ --sort-files
+ --color
+ --context=1
+ --follow
+#+END_SRC
+
+Check also:
+[[http://use.perl.org/use.perl.org/_Ovid/journal/36430.html][vim with
+ack integration]].
+
+Oh, and it's the only program with =--thpppt= option!