error bash

install/install-ubuntu.sh

@@ -1,5 +1,12 @@
 #!/bin/bash
 
+################################# 
+# 	set USERNAME 		#
+################################# 
+
+USERNAME=
+
+if [ -z "$USERNAME" ]; then 
 
 	# ------------------------
 	# install wireguard jq
@@ -24,7 +31,7 @@ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
 	sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
 	sudo apt update
 	sudo apt install -y docker-ce
-sudo usermod -aG docker [USERNAME]
+	sudo usermod -aG docker $USERNAME
 
 	# ------------------------
 	# install docker-compose
@@ -42,3 +49,5 @@ sudo npm install -g pm2
 
 	echo ""
 	echo "run ./install.sh"
+
+fi