diff --git a/installer.sh b/installer.sh
index 1c34d43..070d0c7 100644
--- a/installer.sh
+++ b/installer.sh
@@ -1,29 +1,39 @@
 #/bin/bash
 
+set -eou pipefail
+
 # Create systemd user directory
 echo "Create systemd user directory."
 mkdir -vp ~/.config/systemd/user
+echo
 
 # Copy unit files
 echo "Copy  unit files."
 cp -v theme-switcher.{service,timer} ~/.config/systemd/user
+echo
 
 # Add username to service file
 echo "Edit service unit file."
 sed -i "s/username/$(whoami)/g" ~/.config/systemd/user/theme-switcher.service
+echo
 
 # Make directory for scripts
 echo "Create script directory in /home."
 mkdir -vp ~/.theme-switcher
+echo
 
 # Copy script file
 echo "Copy script into directory."
 cp -v *.sh ~/.theme-switcher
+echo
 
 # Enable and start timer
 echo "Enabling timer."
 systemctl --user enable theme-switcher.timer
+echo
 echo "Starting timer."
 systemctl --user start theme-switcher.timer
+echo
 echo "Starting service."
-systemctl --user start theme-switcher
\ No newline at end of file
+systemctl --user start theme-switcher
+echo
\ No newline at end of file