glob(...) public

Returns the filenames found by expanding pattern which is an Array of the patterns or the pattern String, either as an array or as parameters to the block. Note that this pattern is not a regexp (it’s closer to a shell glob). See File::fnmatch for the meaning of the flags parameter. Note that case sensitivity depends on your system (so File::FNM_CASEFOLD is ignored)

*:Matches any file. Can be restricted by other values in the glob. * will match all files; c* will match all files beginning with c; *c will match all files ending with c; and c will match all files that have c in them (including at the beginning or end). Equivalent to / .* /x in regexp.
**:Matches directories recursively.
?:Matches any one character. Equivalent to /.{1}/ in regexp.
[set]:Matches any one character in set. Behaves exactly like character sets in Regexp, including set negation ([^a-z]).
{p,q}:Matches either literal p or literal q. Matching literals may be more than one character in length. More than two literals may be specified. Equivalent to pattern alternation in regexp.
<code></code>:Escapes the next metacharacter.
   Dir["config.?"]                     #=> ["config.h"]
   Dir.glob("config.?")                #=> ["config.h"]
   Dir.glob("*.[a-z][a-z]")            #=> ["main.rb"]
   Dir.glob("*.[^r]*")                 #=> ["config.h"]
   Dir.glob("*.{rb,h}")                #=> ["main.rb", "config.h"]
   Dir.glob("*")                       #=> ["config.h", "main.rb"]
   Dir.glob("*", File::FNM_DOTMATCH)   #=> [".", "..", "config.h", "main.rb"]

   rbfiles = File.join("**", "*.rb")
   Dir.glob(rbfiles)                   #=> ["main.rb",
   libdirs = File.join("**", "lib")
   Dir.glob(libdirs)                   #=> ["lib"]

   librbfiles = File.join("**", "lib", "**", "*.rb")
   Dir.glob(librbfiles)                #=> ["lib/song.rb",

   librbfiles = File.join("**", "lib", "*.rb")
   Dir.glob(librbfiles)                #=> ["lib/song.rb"]
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October 20, 2009
2 thanks

Getting relative path from absolute globbing

Say you want to scan for files in directory base_dir and you want to use the relative path from this base dir, you could do it like this:

base_dir = '/path/to/dir'
files = Dir[File.join(base_dir, '**', '*.yml')]

# files now contain absolute paths:
files.first # => "/path/to/dir/foo/bar.yml"

# let's make them relative
base_pathname = Pathname.new(base_dir)
files = files.collect do |file|

files.first # => "foo/bar.yml"

Of course, a more common use-case could be the following:

def scan_for_documents!
  base_path = Pathname.new(self.base_path)
  self.contained_files = []
  Dir[File.join(self.base_path, '**', '*.pdf')].each do |full_path|
    path = Pathname.new(full_path).relative_path_from(base_path)
    self.contained_files << path
August 19, 2011
0 thanks

Alternative way to show relative paths from absolute globbing

An alternative to show relative paths is using the well known String#sub! method

base_dir = File.expand_path("my_dir") << "/" # don't miss adding "/"
files = Dir[File.join(base_dir, '**', '*.html.gz')]
p files.map {|f| f.sub!(base_dir,"")}
May 2, 2017
0 thanks

And yet another way to get relative path from absolute globbing

If you execute glob within a block passed to Dir.chdir, you get the paths relative to the directory specified by Dir.chdir… like this…

base_dir = '/path/to/dir'
files = Dir.chdir(base_dir) do
files.first # => 'foo/bar.yml'