diff --git a/ls.rb b/ls.rb
index 547acb4..1514a17 100644
--- a/ls.rb
+++ b/ls.rb
@@ -5,20 +5,37 @@ require 'optparse'
 COLUMNS = 3
 
 def run
-  listed_filenames = option_filenames
+  listed_filenames = list_filenames
   filenames_matrix = slice_filenames(listed_filenames)
   filled_filenames = fill_filenames(filenames_matrix)
   arrange_filenames(filled_filenames)
 end
 
-def option_filenames
-  params = ARGV.getopts('a', 'r')
+def list_filenames
+  params = ARGV.getopts('a', 'r', 'l')
   flags = params['a'] ? File::FNM_DOTMATCH : 0
-  listing = Dir.glob('*', flags)
+  params['l'] ? option_l : 0
+  filenames = Dir.glob('*', flags)
   if params['r']
-    listing.reverse
+    filenames.reverse
   else
-    listing
+    filenames
+  end
+end
+
+def permission
+  list_filenames.each do |index|
+    file_stat = File::Stat.new
+    case file_stat.mode.to_s(8)[index]
+    when '0' then print '---'
+    when '1' then print '--x'
+    when '2' then print '-w-'
+    when '3' then print '-wx'
+    when '4' then print 'r--'
+    when '5' then print 'r-x'
+    when '6' then print 'rw-'
+    when '7' then print 'rwx'
+    end
   end
 end