diff --git a/.gitignore b/.gitignore
index 560a91d84e..43eb94a603 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,6 +13,7 @@
 /test/tmp/
 /test/version_tmp/
 /tmp/
+.idea/
 
 # Used by dotenv library to load environment variables.
 # .env
diff --git a/06.wc/wc.rb b/06.wc/wc.rb
new file mode 100755
index 0000000000..2f5ffca120
--- /dev/null
+++ b/06.wc/wc.rb
@@ -0,0 +1,68 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'pry'
+require 'optparse'
+
+opt = OptionParser.new
+@option = {}
+opt.on('-l') { |v| @option[:l] = v }
+opt.parse!(ARGV)
+
+def cal_lines_count(file)
+  file.lines.count
+end
+
+def cal_words_count(file)
+  file.split(/\s+/).size
+end
+
+def display_file_info(file)
+  lines_count = cal_lines_count(File.read(file))
+  words_count = cal_words_count(File.read(file))
+  bytes_count = File.size(file)
+
+  print lines_count
+  print " #{words_count} #{bytes_count}" unless @option[:l]
+  print " #{file}\n"
+end
+
+def defile_file(argv)
+  argv.each do |file|
+    display_file_info(file)
+  end
+end
+
+def display_total(argv)
+  total_line = []
+  total_words = []
+  total_bytes = []
+
+  argv.each do |file|
+    total_line << cal_lines_count(File.read(file))
+    total_words << cal_words_count(File.read(file))
+    total_bytes << File.size(file)
+  end
+
+  print total_line.sum
+  print " #{total_words.sum} #{total_bytes.sum}" unless @option[:l]
+  print ' total'
+end
+
+def display_input_info(content)
+  line_count = cal_lines_count(content)
+
+  print line_count
+  print " #{cal_words_count(content)} #{content.size}" unless @option[:l]
+end
+
+def main
+  if ARGV.size.zero?
+    display_input_info($stdin.read)
+  else
+    defile_file(ARGV)
+    display_total(ARGV) if ARGV.size >= 2
+  end
+end
+
+main