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.

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The PATH variable that tells the shell which directories to search when looking for executable commands.

Netstat

A command-line tool that displays network connections, routing tables, and interface statistics on a system.

Cron Job

A scheduled task in Unix-like systems that runs automatically at specified times or intervals.

Chroot

A mechanism that changes the apparent root directory for a process and its children, creating an isolated filesystem view.

Pipe

A mechanism that connects the output of one command directly to the input of another, enabling command chaining.

Process

A running instance of a program, with its own memory space, process ID, and system resources.

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What is GRUB?

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