diff --git a/script_GCD.sh b/script_GCD.sh
new file mode 100755
index 0000000..30d1a72
--- /dev/null
+++ b/script_GCD.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+a=$1
+b=$2
+
+while [ $b -ne 0 ]; do
+    t=$b
+    b=$((a % b))
+    a=$t
+done
+
+echo $a