diff --git a/tools/install.sh b/tools/install.sh
index ae5fc51..c68b7e7 100755
--- a/tools/install.sh
+++ b/tools/install.sh
@@ -12,13 +12,15 @@
 
 set -e
 
+if [ $UID -eq 0 ]; then CMD_PREFIX="sudo"; else CMD_PREFIX=""; fi
+
 if [ "$SHELL" != "$(which zsh)" ]; then
 	echo "$(which zsh)"
-	sudo echo "enter pass...."
+	$CMD_PREFIX echo "enter pass...."
 
 	echo "ok"
 
-	sudo apt-get -yq install curl dialog git nano zsh
+	$CMD_PREFIX apt-get -yq install curl dialog git nano zsh
 fi
 
 if [ 1 == 2 ]; then