-[ -x /sbin/update-grub -a -f /etc/sysconfig/grub ] && . /etc/sysconfig/grub
-if [[ "$UPDATE_GRUB" != [Nn][Oo] ]]; then
- /sbin/update-grub
+if [ -x /sbin/update-grub -a -f /etc/sysconfig/grub ]; then
+ if [ "$(. /etc/sysconfig/grub; echo ${UPDATE_GRUB:-yes})" = "yes" ]; then
+ /sbin/update-grub >/dev/null
+ fi