diff --git a/sheet05/a1/create_user.sh b/sheet05/a1/create_user.sh
index e69de29..fe296d6 100644
--- a/sheet05/a1/create_user.sh
+++ b/sheet05/a1/create_user.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+# $1 = username, $2 = comma-separated groups
+useradd -G "$2" -m -s /bin/bash "$1" || usermod -aG "$2" "$1"
\ No newline at end of file