Boot Loaders

Boot loaders load the Linux kernel and initramfs, pass parameters, and support multi-boot.

GRUB Configuration Location

Input:

ls /boot/grub*/grub.cfg

Output:

/boot/grub/grub.cfg

Shows the active GRUB configuration file.

References:

• https://www.gnu.org/software/grub/manual/

Listing Installed Kernels

Input:

ls /boot/vmlinuz-*

Output:

/boot/vmlinuz-6.6.0
/boot/vmlinuz-6.1.0

Useful to verify available kernel versions for bootloader entries.

References:

• https://man7.org/linux/man-pages/man1/ls.1.html

Examining Kernel Parameters

Input:

cat /proc/cmdline

Output:

BOOT_IMAGE=/vmlinuz-6.6.0 root=/dev/sda1 ro quiet splash

Shows parameters passed by the bootloader to the kernel.

References:

• https://man7.org/linux/man-pages/man5/proc.5.html

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