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Yes, it is provided by GRUB. The GRUB command shell is just as powerful as the shell. You can use it to discover boot images, kernels, and root filesystems. When you're at the grub> prompt, you have a lot of functionality similar to any command shell such as history and tab-completion. The grub rescue> mode is more limited, with no history and no ...


First directly editing is not a reliable method because this file is the result of various scripts which build the menu in sections. But mainly every time you upgrade to a new kernel (installations/removals, updates) your /boot/grub/grub.cfg will be overwritten and you will lose your changes. Thats why you should not directly edit it.


In Fedora, you can use the following script. Note that this is mostly the same as described in, with a few modifications for GRUB 2 in Fedora. #!/bin/bash if [ `readlink /boot/grub2/grubenv` == "/boot/efi/EFI/fedora/grubenv" ]; then sudo mv /boot/grub2/grubenv /boot/grub2/grubenv-original sudo ln -s ...

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