diff --git a/GCD.sh b/GCD.sh
new file mode 100755
index 0000000..02d30ff
--- /dev/null
+++ b/GCD.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+a=$1
+b=$2
+while [ $b -ne 0 ]; do
+    r=$((a % b))
+    a=$b
+    b=$r
+done
+echo $a