linux cheat sheet / published by https://github.com/dacr/code-examples-manager #72f98eec-0693-4e64-ab38-f22b3ca30010/b7178b895feb7d2a5a9582492ef897c81df42964

linux.md

linux cheat sheet

sound control

select output device (for chrome => use pavucontrol)

pavucontrol
pacmd

RAID / BIOS LEVEL

• apt-get install dmraid
• dmraid -s : status
• dmraid -r : disk associations
• dmsetup ls
• dmsetup info
• dmsetup info /dev/dm-0

Notes:

• https://www.waldonell.com/thoughts/articles/replacing-a-raid-drive-using-fakeraid-dmraid-on-linux

hdd disk checks

lsblk
iostat -x 2
smartctl -a /dev/sda
iotop

Notes:

• https://madflojo.medium.com/troubleshooting-high-i-o-wait-in-linux-358080d57b69

get my ip address

hostname -I | awk '{print $1}'

file system inodes

The max inodes number can only be set at file system format.

• check current directory inodes usage : du --inode .
• check current file system inodes statistics : df -ih .

linux grub edit

• quiet splash => text
• quiet splash nomodeset

linux extract information

inxi -Fxz
lshw
lshw -short
lsblk
lsusb
lscpu
lcpci
dmidecode -t bios
dmidecode -t processor
nvidia-smi

linux repair

boot from USB and then chroot using local disk file system.

mkdir /rescue

fdisk -l
mount /dev/sda6 /rescue
ls -l /rescue
mount /dev/sda4 /rescue/boot
ls -l /rescue/boot

mount -t proc proc /rescue/proc
mount -t sysfs sys /rescue/sys
mount -o bind /dev /rescue/dev
mount -t devpts pts /rescue/dev/pts

chroot /rescue

cat /etc/resolv.conf

linux random generator entropy

cat /proc/sys/kernel/random/entropy_avail
sudo apt-get install rng-tools 

iso images to USB disk

lsblk
dd if=path-to-image of=/dev/sdX

start wifi network

wpa_passphrase ESSID passphrase | tee wpa_supplicant.conf
wpa_supplicant -c wpa_supplicant.conf -i wlp5s0

imprimante laser brother CDW MFC 9330CDW

Absolument installer ce packet, pour que les documents PDF s'impriment correctement, l'impression directe n'est pas supportée

sudo apt-get install a2ps

Notes :

• https://forums.fedora-fr.org/viewtopic.php?id=53094

some file system cleanup

Keep newest directories, remove those whose file status is > 1*24h

find . -maxdepth 1 -type d -ctime +1 -exec rm -fr {} \;