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Given this example folder structure:

/folder1/file1.txt
/folder1/file2.djd
/folder2/file3.txt
/folder2/file2.fha

How do I do a recursive text search on all *.txt files with grep from "/"?

("grep -r <pattern> *.txt" fails when run from "/", since there are no .txt files in that folder.)

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5 Answers 5

up vote 23 down vote accepted

My version of GNU Grep has a switch for this:

grep -R foo --include '*.txt' *

"--include=GLOB Search only files whose base name matches GLOB (using wildcard matching as described under --exclude)."

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If you have a large number of files it would be useful to incorporate xargs into the command to avoid an 'Argument list too long' error.

find . -name '*.txt' -print | xargs grep <pattern>
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4  
If there are spaces in any of the file or directory names, use this form: find . -name '*.txt' -print0 | xargs -0 grep <pattern> –  Jason Luther May 19 '09 at 13:37
    
And of course there's the issue of filenames that start with -. –  T.J. Crowder Feb 7 '11 at 12:08
find . -name '*.txt' -type f -exec grep <pattern> {} \;
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you might want to use "find . -name '*.txt' -type f -exec grep <pattern> {} +" instead so that it rather behaves similiar the verision with from Mark Robinson - works only with GNU find to my knowledge –  Server Horror Jun 10 '09 at 8:49

Mannis answer would fork a new grep-process for every textfile. If you have lots of textfiles there, you might consider grepping every file first and pick the .txt-files when thats done:

grep -r <pattern> * | grep \.txt:

That's more disk-intensive, but might be faster anyway.

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You may want to take a look at ack at http://betterthangrep.com, which has facilities for selecting files to search by filetype.

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