You must always use the bootadm command to locate the GRUB menu's menu.lst file. The list-menu subcommand finds the active GRUB menu. The menu.lst file lists all the operating systems that are installed on a system. The contents of this file dictate the list of operating systems that is displayed on the GRUB menu. If you want to make changes to this file, see Locating the GRUB Menu’s menu.lst File (Tasks) in Solaris 10 5/08 Installation Guide: Solaris Live Upgrade and Upgrade Planning.