diff --git a/env_exam.rb b/env_exam.rb
deleted file mode 100644
--- a/env_exam.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-
-PROBLEMS_DIR = "/home/jittat/grader/ev"
-
-USER_RESULT_DIR = "/home/jittat/grader/result"
-
-TALKATIVE = true
-
-def report_comment(comment)
-  if comment.chomp =~ /^P+$/    # all P's
-    'passed'
-  else
-    'failed'
-  end
-end
diff --git a/env_exam.rb.SAMPLE b/env_exam.rb.SAMPLE
new file mode 100644
--- /dev/null
+++ b/env_exam.rb.SAMPLE
@@ -0,0 +1,14 @@
+
+PROBLEMS_DIR = "/home/jittat/grader/ev"
+
+USER_RESULT_DIR = "/home/jittat/grader/result"
+
+TALKATIVE = true
+
+def report_comment(comment)
+  if comment.chomp =~ /^P+$/    # all P's
+    'passed'
+  else
+    'failed'
+  end
+end
diff --git a/env_grading.rb b/env_grading.rb
deleted file mode 100644
--- a/env_grading.rb
+++ /dev/null
@@ -1,10 +0,0 @@
-
-PROBLEMS_DIR = "/home/jittat/grader/ev"
-
-USER_RESULT_DIR = "/home/jittat/grader/result"
-
-TALKATIVE = true
-
-def report_comment(comment)
-  comment.chomp
-end
diff --git a/env_grading.rb.SAMPLE b/env_grading.rb.SAMPLE
new file mode 100644
--- /dev/null
+++ b/env_grading.rb.SAMPLE
@@ -0,0 +1,10 @@
+
+PROBLEMS_DIR = "/home/jittat/grader/ev"
+
+USER_RESULT_DIR = "/home/jittat/grader/result"
+
+TALKATIVE = true
+
+def report_comment(comment)
+  comment.chomp
+end
diff --git a/environment.rb b/environment.rb
deleted file mode 100644
--- a/environment.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-
-# Rails app directory
-RAILS_APP_DIR = "/home/jittat/web_grader"
-
-# load the required environment file
-require "env_#{GRADER_ENV}.rb"
diff --git a/environment.rb.SAMPLE b/environment.rb.SAMPLE
new file mode 100644
--- /dev/null
+++ b/environment.rb.SAMPLE
@@ -0,0 +1,6 @@
+
+# Rails app directory
+RAILS_APP_DIR = "/home/jittat/web_grader"
+
+# load the required environment file
+require "env_#{GRADER_ENV}.rb"