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When I want to perform a recursive grep search in the current directory, I usually do:

grep -ir "string" .

But that command searches inside all kinds of files, including binary files (pictures, audio, video, etc...) which results in a very slow search process.

If I do this, for example, it doesn't work:

grep -ir "string" *.php

It doesn't work because there are no PHP files inside the current directory, but inside some of the subdirectories in the current directory, and the subdirectories' names don't end with ".php" so grep doesn't look inside them.

So, how can I do a recursive search from the current directory but also specifying filename wildcards? (i.e: only search in files which end in a specific extension)

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2 Answers 2

up vote 2 down vote accepted

Use grep's --include option:

grep -ir "string" --include="*.php" .
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Ok, it seems my version of grep was old, because it didn't have that option (no wonder why I couldn't figure out how to do this!). I got the message: "grep: unrecognized option `--include=*.php'". But I just upgraded to a newer one and now it works. Thank you! –  OMA May 23 at 9:03

If you have a version of grep that lacks the --include option, you can use the following. These were both tested on a directory structure like this:

$ tree
.
├── a
├── b
│   └── foo2.php
├── c
│   └── d
│       └── e
│           └── f
│               └── g
│                   └── h
│                       └── foo.php
├── foo1.php
└── foo.php

Where all the .php files contain the string string.

  1. Use find

    $ find . -name '*php' -exec grep -H string {} \; 
    ./b/foo2.php:string
    ./foo1.php:string
    ./c/d/e/f/g/h/foo.php:string
    

    Explanation

    This will find all .php files and then run grep -H string on each of them. With find's -exec option, {} is replaced by each of the files found. The -H tells grep to print the file name as well as the matched line.

  2. Assuming you have a new enough version of bash, use extglob :

    $ shopt -s globstar
    $ grep -H string  **/*php
    b/foo2.php:string
    c/d/e/f/g/h/foo.php:string
    foo1.php:string
    

    Explanation

    As explained in the bash manual:

    globstar

    If set, the pattern ‘**’ used in a filename expansion context will match all files and zero or more directories and subdirectories. If the pattern is followed by a ‘/’, only directories and subdirectories match.

    So, by running shopt -s globstar you are activating the feature and Bash's globstar option which makes **/*php expand to all .php files in the current directory (** matches _0 or more directories, so **/*php matches ./foo.php as well) which are then grepped for string.

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