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Linux Boot Process | Stage 2: GRUB & GRUB2 | Demo Ubuntu & CentOS | CompTIA Linux+ Prep 

Mimz Techritory
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Hi guys! Mimz here and welcome back! Today's tech tutorial is on the Linux boot process, specifically a preparation for the CompTIA Linux+ exam.
This video is part 2 of 3 for the Linux boot process. If you missed part 1, please see the link below.
Video 1: Stage 1: BIOS and UEFI | CompTIA Linux+ Prep - • Linux Boot Process | S...
Today I will cover Stage 2: GRUB and GRUB2. I will cover what they are, the differences, and demonstrate where boot files are on Ubuntu and CentOS.
GRUB: Grand Unified Bootloader
GRUB: the way a computer transitions from BIOS or UEFI boot up conditions to the OS
GRUB:
Older and limited
Hard to modify the configuration files - /etc/default
Display boot menu at startup
Boot files: menu.lst or grub.conf
GRUB2:
Newer and most used
More customizable config files - /etc/default
Hidden boot menu at startup
More boot methods: ISO, USB, UUID, etc
Boot files: grub.cfg
Ubuntu Commands:
Boot folder: cd /boot/grub
GRUB Config file: cat /etc/default/grub
Make changes: sudo update-grub
CentOS
boot folder: cd /boot
GRUB Config File: cd /etc/default
Exit Vi: :q!
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Опубликовано:

 

8 сен 2024

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Комментарии : 12   
@AdvaTced
@AdvaTced 2 месяца назад
i like the "hands-on" instructions of yours, keep going
@JoseGallego-mj3jg
@JoseGallego-mj3jg 3 месяца назад
hola desde Colombia, excelente video, justo lo que necesitaba
@ezlos-swm3353
@ezlos-swm3353 2 года назад
Great video! Looking forward to the rest of the series!
@mimztechritory
@mimztechritory 2 года назад
Thank you so much! 😁
@robertel3113
@robertel3113 23 дня назад
i like this way, thnx
@KenTeague72
@KenTeague72 Год назад
Nice tutorial. A few critiques, if I may: 1. CentOS is no longer funded by Red Hat. Rocky Linux is the successor. Fedora is another option on the bleeding edge. 2. From the grub (8) manual page, you can type grub --version to obtain your version number. Most command line tools that are not built into the shell will typically have a --version argument that you can pass to it, or -v for short. When in doubt, reference the manual page for said command. 3. vi isn't short for view. It's the vi editor. From Wikipedia "The name "vi" is derived from the shortest unambiguous abbreviation for the ex command visual, which switches the ex line editor to its full-screen mode. The name is pronounced /ˌviːˈaɪ/ (the English letters v and i)." 4. The vi editor has two modes; ex mode (sometimes known as "command" mode) and insert mode. In ex mode, you can input ex commands which are not inserted into the file, but, instead, issues an ex command to vi that instructs it to perform the defined operations. In your video, you issued the :q! command which is quit without saving. Alternatively, in insert mode, you are directly inserting text into your file. You can switch to ex mode by pressing the ESC key, and insert mode by pressing the I key. 5. To simply view a file, you can use the cat command, like "cat grub.cfg". If the file is too large to fit on the screen, you can pipe it to a pager tool like "more" or, even better "less", like "cat grub.cfg | more" or "cat grub.cfg | less", or simply omit the use of cat and use the pager tool to view the file contents a la "more grub.cfg" or "less grub.cfg". Which to use and why? cat can be found on old school UNIX systems. I believe "more" can as well, but more doesn't allow you to scroll backwards in a file being viewed. "less" can do all kinds of goodness but is a 3rd party tool, however, you can typically find "less" on most modern day Linux systems by default. I'm not sure about *BSD flavors.
@ywahab25
@ywahab25 Месяц назад
I can determine GRUB version also by command [grub-install --version] or [grub2-install --version]
@michaelhoman7748
@michaelhoman7748 Год назад
Keep em coming
@mimztechritory
@mimztechritory Год назад
More vids brewing ::)
@amigoscanariosdeclashofclan
@amigoscanariosdeclashofclan 3 месяца назад
Thanks a lot!
@pauldox
@pauldox Год назад
question: why am i having 2 different wallpapers in my boot loader? the one i can set displays when i logout/shutdown my pc and one on startup. how can i change both of them?
@GrindAlchemyTech
@GrindAlchemyTech 9 месяцев назад
Thankyou 🙌🏽
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