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Linux Intermediate

What is GRUB?

The Grand Unified Bootloader, a program that loads the operating system kernel into memory during system startup.

GRUB is the most common bootloader for Linux systems. It presents a menu allowing users to choose between installed operating systems or kernel versions. GRUB2, the current version, supports various filesystems, module loading, and rescue mode.

Configuration is typically managed through /etc/default/grub and updated with update-grub or grub-mkconfig.

Related Terms

Linux Kernel Module
A piece of code that can be loaded into the kernel at runtime to extend functionality without rebooting, such as device drivers and filesystems.
File Permissions
A security mechanism that controls who can read, write, or execute files and directories in Unix-like systems.
Pipe
A mechanism that connects the output of one command directly to the input of another, enabling command chaining.
Systemctl
The primary command for managing systemd services, including starting, stopping, enabling, and checking service status.
Mount Point
A directory in the filesystem where a storage device or partition is attached and made accessible.
Chroot
A mechanism that changes the apparent root directory for a process and its children, creating an isolated filesystem view.
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