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Get laptop model or motherboard model
February 13, 2026
Just like that 
sudo dmidecode -s system-product-name
linux


Single mode saves you
February 13, 2026
Sometimes bad things happen. Crooked arms, crooked updates etc. This feature saves me many times.

Choose recovery in your GRUB menu, then press "e" to edit boot options, then find the line that starts with "linux" word, it usually has words like "splash" and "quiet", then add to the end of this line word "single".

Example: 
linux   /boot/vmlinuz-6.12 root=UUID=249a1099-3034-4084-af21-b489693602fd ro  panic=30 quiet splash
Change to this: 
linux   /boot/vmlinuz-6.12 root=UUID=249a1099-3034-4084-af21-b489693602fd ro  panic=30 quiet splash single


And finally press F10 or Ctrl+x to boot with your changed options.
This allows you to boot in single-user mode as root.
linux


Convert Windows line endings to Linux in Vim
June 08, 2025
Original solution is here

Short explain 
:%s/^M//g
Use Ctrl+v-m to input ^M in Linux
Use Ctrl+q-m to input ^M in Windows

I-i-i, wanna fall from the stars
vim linux


screensaver for console, cmatrix + screen [useless]
July 31, 2024
Install cmatrix (Debian, Ubuntu) 
sudo apt install cmatrix

vim ~/.screenrc 
blankerprg cmatrix -abs -u5 # check out cmatrix -h
idle 60 blanker
linux


grep the lines that does NOT contain pattern
July 30, 2024
man grep 
-v, --invert-match
       Invert the sense of matching, to select non-matching lines.
Example 
cat access_log_with_utm_source.log | sudo grep -v "gclid\|msclkid" > no_gclid_msclkid.log
linux


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