Commands Linux

Create rsh rsa key and add to authorized_keys

ssh-keygen -t ed25519 -C "your_email@example.com"
cat ~/.ssh/id_ed25519.pub
# In other machine
echo "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC3..." >> ~/.ssh/authorized_keys

# check authorized_keys rights
ls -l ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

Troubleshooting

Check if ssh allows public key authentication

nano /etc/ssh/sshd_config
# check if the following lines are uncommented
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys

use scp to copy file

# copy directory from host to remote
scp -r username@remote:/path/to/remote/dir /path/to/local/dir

Find file by name

find ./ -name "filename"

Screen

Setup custom screen resolutions

cvt 2560 1080 30
# 2560x1080 29.97 Hz (CVT) hsync: 33.03 kHz; pclk: 106.75 MHz
Modeline "2560x1080_30.00"  106.75  2560 2640 2896 3232  1080 1083 1093 1102 -hsync +vsync
xrandr --newmode "2560x1080_30.00"  106.75  2560 2640 2896 3232  1080 1083 1093 1102 -hsync +vsync
xrandr --addmode HDMI-1 2560x1080_30.00

Keyboard

Change keyboard layout

sudo loadkeys fr

APT

Sources location

ls /etc/apt/sources.list.d/

User

Find current user uuid

id -u

Find group name

id -g -n tom

Find ip on network

sudo arp-scan --interface=wlp3s0 192.168.1.0/24