From b9adc05f760966506557ce5970bea50d4ac6bbc5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C8=98tefan-Iulian=20Alecu?=
 <165364995+pascalecu@users.noreply.github.com>
Date: Wed, 13 May 2026 22:38:30 +0300
Subject: [PATCH] Add Rot13 in Ruby

---
 archive/r/ruby/rot13.rb | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 archive/r/ruby/rot13.rb

diff --git a/archive/r/ruby/rot13.rb b/archive/r/ruby/rot13.rb
new file mode 100644
index 000000000..6bedc091f
--- /dev/null
+++ b/archive/r/ruby/rot13.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+USAGE = "Usage: please provide a string to encrypt"
+
+def usage!
+  warn USAGE
+  exit 1
+end
+
+def rot13(str)
+  str.tr("A-Za-z", "N-ZA-Mn-za-m")
+end
+
+input = ARGV.first
+usage! if input.nil? || input.strip.empty?
+
+puts rot13(input)