Grep Include Only *.txt File Pattern When Running Recursive Mode

I‘m using Debian Linux as my development workstation. I would like to search a directory called ~/projects/ recursively for “foo” word only for *.txt files. How do I search all text files in ~/projects/ for “foo” word using grep command?

The grep command supports recursive file pattern

Tutorial details
DifficultyEasy (rss)
Root privilegesNo
Requirementsgrep
TimeN/A
option as follows:

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grep -R "pattern" /path/to/dir/

To limit your search for *.txt, try passing the --include option to grep command

Syntax and examples for --include option

The syntax is:

grep -R --include=GLOB "pattern" /path/to/dir
grep -R --include="*.txt" "pattern" /path/to/dir
grep -R --include="*.txt" "foo" ~/projects/

You can include files whose base name matches GLOB using wildcard matching. A file-name glob can use *, ?, and […] as wildcards, and \ to quote a wildcard or backslash character literally. You can ignore case distinctions in both the PATTERN and the input files with -i optoon i.e. case-insensitive search. In this following example, search for all *.py, *.pl, and *.sh files for “main” word in my /raid6/projects/sysmanagement/ directory:

grep --color -Ri --include="*.py" --include="*.sh" --include="*.pl" "main" /raid6/projects/sysmanagement/

OR

grep --color -Ri  --include=*.{py,pl,sh} "main" /raid6/projects/sysmanagement/

OR a safer option would be (note –color removed and * replaced with \*):

grep -Ri  --include=\*.{py,pl,sh} "main" /raid6/projects/sysmanagement/

The --include option provides you the following advantages:

  1. Speed up the search.
  2. Only match given file pattern.
  3. Do not search for binary files such as compiled files or image files. In other words only look for *.txt or *.py file patterns and so on.
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9 comments… add one
  • better Oct 25, 2012 @ 19:32

    this isn’t portable and includes lots of annoying GNUisms.

    It is better to use find . -name \*.txt | xargs grep

  • Ryan Oct 26, 2012 @ 1:08

    It’s really a awful way to use grep that I havn’t seen. I also use find . -name \*.txt | xargs grep before.

  • Chris F.A. Johnson Oct 26, 2012 @ 2:39

    This matches file names; it doesn’t use globbing:

    grep -R –include=GLOB “pattern” /path/to/dir

    In other words, it will include dot files, which globbing does not.

  • Maik K Oct 26, 2012 @ 10:56

    How about enabled globstar(which most ppl I know have anyway) and then grep “foo” /path/**.txt ? Works at least in the richer shells like bash or zsh.

  • Pepe Oct 26, 2012 @ 15:29

    xargs? ewwwwggg. What real men do is:

    find /some/path -type f -name *.txt -exec grep “pattern” {} +

  • Balakrishnan B Oct 26, 2012 @ 16:15

    Zsh Only
    grep “pattern” **/*.txt

    May not work if the number of matching files are too many.

  • Chris F.A. Johnson Oct 26, 2012 @ 21:14

    Balakrishnan, ** also works in bash (version 4) with the globstar option.

  • Sid Burn Nov 16, 2012 @ 10:40

    Real man just use:

    ack –text “pattern”

  • Konrad Dec 28, 2016 @ 11:40

    +1 to find | xargs grep something

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