diff --git a/script_GCD.sh b/script_GCD.sh
new file mode 100755
index 0000000..4228d9b
--- /dev/null
+++ b/script_GCD.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+# GCD
+a="$1"
+b="$2"
+while [ $a -ne  0 ] && [ $b -ne 0 ]; do
+    if [ $a -gt $b ]; then
+	    a=$((a % b))
+    else 
+	    b=$((b % a))
+    fi
+done
+echo $((a + b))
+
+