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I have started using ack which is much faster than grep. However using ack I want to search for file name rather than file contents. Is there a way to do that?

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Use the right tool for the right job. If you want to search for filename, use 'find':

$ # search for all *.txt file in current directory
$ find . -iname "*.txt"
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    very true. "once you hold a hammer in your hand everything starts to look like a nail" :) – akira Apr 25 '10 at 15:05
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    Well, ack (and grep) are nicer because you don't have to be explicit about regexes unless you want to. I usually just do a find . | ack whatev.ext – Ehtesh Choudhury May 25 '12 at 15:49
  • This works for finding directories as well. – Pratik Khadloya Jul 24 '12 at 17:03
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    find and ack behave differently since ack filters out a lot of results by default (contents of version control directories, compiled objects in a source repository) that would be included by find. The best hammer depends on the results you want. – Joshua Goldberg Jan 8 '15 at 22:05
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    This is not answering the question... – lajarre Jun 26 '15 at 9:42
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ack -g REGEX

Print files where the relative path + filename matches REGEX

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    add [^/]*$ to your REGEX to search in the filename only – simon Sep 3 '17 at 1:14
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I agree it makes sense to use find if you're just searching for *.txt files. However, ack has powerful file-type detectiong features, so you can use

ack -f --perl

which will find all the Perl files, based on both the filename (*.pm, *.pl, *.t and *.pod) and the shebang line.

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You can do :

ack -f | ack "filename.ext"
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