zemerdon.com

Posted: **Sat Jun 21, 2025 5:45 am**

watch with pipe

watch -n10 'df -ah | grep "p4"'

list connected usb transfer rate

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lspci -t

change linux startup/shutdown text size

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 run: sudo dpkg-reconfigure console-setup, and follow the prompts. It was pretty self-explanatory.

apt upgrade latest package/use backports

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root@server:/home/zemerdon# apt-get -t bullseye-backports install zfs-dkms zfsutils-linux zfs-zed

find current gpu driver version

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root@server:/home/zemerdon# glxinfo | grep string

list installed linux packages installed one liner

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apt list --installed | cut -f1 -d / | tr "\n" " "
apt list --installed | awk -F/ '{s=$1" "s} END{print s}' 
apt list --installed | sed -E ':a;N;$!ba;s/\n/ /g;s/\/[^]]+\]//g'

ubuntu server installation ipv4 setup

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Subnet: 192.168.1.0/24
Address: 192.168.1.101
Gateway: 192.168.1.1
Name servers: 8.8.8.8

debian find services that failed on startup

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journalctl -b0 _PID=1 | grep Failed

problematic startup services. boot service times.

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 system-analyze blame

prevent automatic service restarts, you can also mask the service

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systemctl mask upower.service

df returns /efi not found and/or takes a long time to respond. Disable system-gpt-auto-generator.
"systemd-gpt-auto-generator — Generator for automatically discovering and mounting root, /home/, /srv/, /var/ and /var/tmp/ partitions, as well as discovering and enabling swap partitions, based on GPT partition type GUIDs".

edit /etc/default/grub

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GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX_DEFAULT="systemd.gpt_auto=0"
#GRUB_CMDLINE_LINUX="modprobe.blacklist=nvme"

mount disk .img.
if img is disk use losetup then mount. if img is partition use mount only.

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losetup --find --show disk.img
 mount /dev/loop1p1 /mnt/part1

extract ALL rars in all directories into their respective directories. run from the top level.

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rar x -r -ad *.rar

monitor a current process output with tail

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cd /proc/<pid here>/fd && tail -f *

motherboard information

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dmidecode -t 2

RAM information

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sudo dmidecode --type 17

apt install specific package version

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sudo apt-get install gparted=0.16.1-1

what video driver is in use

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lspci -nnk | egrep -i --color 'vga|3d|2d' -A3 | grep 'in use'

QEMU list booted VMs

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virsh -c qemu:///system list

find pdf password

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./pdfcrack ../document.pdf

remove pdf security

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pdftk input.pdf input_pw YOURPASSWORD output output.pdf

Posted: **Tue Dec 09, 2025 4:15 pm**

quickly change apt mirror

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sudo sed -i 's/ftp.au.debian.org/mirror.aarnet.edu.au/g' /etc/apt/sources.list

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helpful linux commands

helpful linux commands

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