====== Recursive File Search ======
===== grep =====
<code bash>
grep -r --include="*.*" searchtext .
</code>

For example, to search all C# source files for instances of the the text "TODO":

<code bash>
grep -r --include="*.cs" TODO .
</code>

Here's an example that's a little more readable:

<code bash>
grep -rin --include '*.json' -e 'globalmetadata' .
</code>

You can specify multiple extensions in --include like this:

<code bash>
grep -rin --include=\*.{json,cs} -e 'globalmetadata' .
</code>

===== C# =====
<code csharp>
using System.IO;
 
string[] fileList =
Directory.GetFiles(Directory.GetCurrentDirectory(), "*.xml", SearchOption.AllDirectories);
</code>

Change the *.xml mask to whatever search pattern you want. The fileList array will contain a list of all matching files, with fully-qualified paths.

===== Ruby =====
Here’s how to implement a grep-like utility in Ruby which will recursively search subdirectories:

<code ruby>
if (ARGV[0] == nil && ARGV[1] == nil)
 puts ("Usage: rbfilesearch.rb ")
else
 myFile = ARGV[0]
 myText = ARGV[1]
 Dir['**/*' + myFile + '*'].each do |path|
  File.open( path ) do |f|
   f.grep( /#{myText}/ ) do |line|
    puts(path + " : " + line)
   end
  end
 end
end
</code>

{{tag>dotnet ruby}}