This allows us to specify the root directory for GRUB. Just put others, so we manually changed it to Windows 8. GRUB didn’t recognize the operating system. You can put pretty much whatever you want in here. We need a minimum of three lines, title, root, and kernel, for each operating system, and for Linux, we need another line, initrd.

So, back to our GRUB config file, and we have got two operating systems defined, RHEL 6 and Windows 8. Now let’s have a quick look at the operating specific setting. We can add a few more if we need, such as fallback options just in case the default option fails, If we don’t press a key, then the system just boots, and more often than not, to be honest, the hidden menu option is usually specified. Okay, if we hit a key, then we get back to the boot menu that we just saw.

Multi-booting can be a bit of a complicated thing, so a hidden menu lets us hides that menu, and instead, all we get is this. Okay, see here how we can see the menu with the different operating system choices.Īnd at the bottom, here we have got a timer telling us how long we have got until the boot continues. So, we will look at it first without the hidden menu. Let’s take a look at what the early boot process looks like with and without this hidden menu option. Here, the hidden menu option hides the menu of OS (Operating System) choices unless we hit a key. Then splash image, well, that just puts a custom splash image up behind the boot menu, not normally that important other than maybe for branding. Well, this tells us that unless we interrupt the boot process and tell GRUB otherwise, it will boot the first operating system option that we have got specified below, so for us, that’s RHEL 6 Timeout = 10 tells GRUB to give us 10 seconds during which we can press a key to interrupt the boot process. Now, in our example, we have got settings for two operating systems, Windows 8 and RHEL 6.īut let’s take a look at the global setting first. Let’s break it down into its major component.Īt the top here, we have got kind of the global settings,Īnd then below this at the bottom, we have got the operating system specific settings. So let’s go see what the file looks like.

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