[ "x$@" != "x" ] || { usage 1>&2; exit 1; }
-# Authorize the user
+# Authorize the user.
xauth extract - $DISPLAY | sudo -u "$USERNAME" xauth merge -
# Execute the command.
-# NOTE: -i or -s have to be passed in order to open a shell
+# NOTE: -i or -s can be passed in order to open a shell
sudo DISPLAY="$DISPLAY" -u "$USERNAME" "$@"