fix debian-bash-upgrade

install.sh

@@ -41,6 +41,8 @@ function install_host() {
         echo "--------------------------------"
         
         read -rn1 -p 'Would you like to migrate to the new project named `miaou-bash`, (yN)?' answer       
+        [[ -z "$PS1" ]] && answer='y'
+        
         if [[ "$answer" == 'y' ]];then
             pushd /tmp
             pushd /opt/debian-bash