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diff --git a/examples/plain_ruby/config.rb b/examples/plain_ruby/config.rb
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+#!/usr/bin/env ruby
+# Example: Plain Ruby script — no Rake, no bundler required.
+#
+# Run with:
+#   ruby config.rb --dry      # dry run, no changes made
+#   ruby config.rb --debug    # verbose output
+#   ruby config.rb            # apply configuration
+#
+# Requires rcm to be installed as a gem, or adjust the path below:
+#   require_relative '../../lib/dsl'
+require 'rcm'
+
+configure do
+  # Write a simple text file with static content.
+  file '/tmp/example/hello.txt' do
+    manage directory
+    'Hello, World!'
+  end
+
+  # Ensure a specific line is present in another file (idempotent).
+  file '/tmp/example/hosts.txt' do
+    line '127.0.0.1 localhost'
+  end
+
+  # Create a file from an inline ERB template.
+  file '/tmp/example/greeting.txt' do
+    from template
+    'Generated on <%= Time.now.strftime("%Y-%m-%d") %>'
+  end
+end