diff --git a/language.rb b/language.rb
index f93d8c5..52fea6a 100644
--- a/language.rb
+++ b/language.rb
@@ -218,8 +218,8 @@ module Rpl
 
       # FILESYSTEM
       @dictionary.add( 'fread',   proc { |stack, dictionary| Rpl::Lang::Core.fread( stack, dictionary ) } )
-      # @dictionary.add( 'fload',   proc { |stack, dictionary| Rpl::Lang::Core.__todo( stack, dictionary ) } ) # ( filename -- … ) « FREAD EVAL »
-      # @dictionary.add( 'fwrite',  proc { |stack, dictionary| Rpl::Lang::Core.__todo( stack, dictionary ) } ) # ( content filename mode -- ) write content into filename using mode (w, a, …)
+      @dictionary.add( 'feval',   proc { |stack, dictionary| Rpl::Lang::Core.feval( stack, dictionary ) } )
+      @dictionary.add( 'fwrite',  proc { |stack, dictionary| Rpl::Lang::Core.fwrite( stack, dictionary ) } )
 
       # GRAPHICS
     end
diff --git a/lib/core/filesystem.rb b/lib/core/filesystem.rb
index b714e4f..347dc99 100644
--- a/lib/core/filesystem.rb
+++ b/lib/core/filesystem.rb
@@ -8,9 +8,28 @@ module Rpl
         stack, args = Rpl::Lang::Core.stack_extract( stack, [%i[string]] )
 
         path = File.absolute_path( args[0][:value][1..-2] )
-        p path
+
         stack << { type: :string,
-                   value: File.read( path ) }
+                   value: "\"#{File.read( path )}\"" }
+
+        [stack, dictionary]
+      end
+
+      # ( filename -- … ) read and run file
+      def feval( stack, dictionary )
+        stack << { value: '« fread eval »',
+                   type: :program }
+
+        Rpl::Lang::Core.eval( stack, dictionary )
+      end
+
+      # ( content filename mode -- ) write content into filename using mode (w, a, …)
+      def fwrite( stack, dictionary )
+        stack, args = Rpl::Lang::Core.stack_extract( stack, [%i[string], %i[string], :any] )
+
+        path = args[1][:value][1..-2]
+        puts "File.open( #{path}, mode: #{args[0][:value][1..-2]} ) { |file| file.write( #{args[2][:value]} ) }"
+        File.open( path ) { |file| file.write( args[0][:value] ) }
 
         [stack, dictionary]
       end
diff --git a/spec/language_filesystem_spec.rb b/spec/language_filesystem_spec.rb
new file mode 100644
index 0000000..272fc11
--- /dev/null
+++ b/spec/language_filesystem_spec.rb
@@ -0,0 +1,27 @@
+# coding: utf-8
+# frozen_string_literal: true
+
+require 'test/unit'
+
+require_relative '../language'
+
+class TestLanguageTimeDate < Test::Unit::TestCase
+  def test_fread
+    lang = Rpl::Language.new
+    lang.run '"spec/test.rpl" fread'
+
+    assert_equal [{ value: "\"1 2 +
+
+« dup dup * * »
+'trrr' sto
+
+trrr
+\"", type: :string }],
+                 lang.stack
+
+    lang.run 'eval vars'
+    assert_equal [{ value: 27, base: 10, type: :numeric },
+                  { value: ["'trrr'"], type: :list }],
+                 lang.stack
+  end
+end
diff --git a/spec/test.rpl b/spec/test.rpl
new file mode 100644
index 0000000..e4ecb57
--- /dev/null
+++ b/spec/test.rpl
@@ -0,0 +1,6 @@
+1 2 +
+
+« dup dup * * »
+'trrr' sto
+
+trrr