diff --git a/ex01/hello_world.sh b/ex01/hello_world.sh
new file mode 100644
index 0000000..969e537
--- /dev/null
+++ b/ex01/hello_world.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+hello_world() {
+    if [ -n "${1}" ];
+    then echo "Hello, ${1}!"
+    else echo "Hello, World!"    
+    fi        
+}
+
+hello_world $1