Random knowledge

Virtualization

Virtualbox

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On guest machine:

$ sudo apt-get update
$ sudo apt-get install -y virtualbox-guest-utils virtualbox-guest-x11
$ reboot

Fullscreen Debian 11 Bullseye

On Virtualbox:

Devices > Insert Guest Additions CD image

On Guest:

$ sudo mount /dev/cdrom /mnt
$ ls -1 /mnt
AUTORUN.INF
autorun.sh
cert
NT3x
OS2
runasroot.sh
TRANS.TBL
VBoxDarwinAdditions.pkg
VBoxDarwinAdditionsUninstall.tool
VBoxLinuxAdditions.run
VBoxSolarisAdditions.pkg
VBoxWindowsAdditions-amd64.exe
VBoxWindowsAdditions.exe
VBoxWindowsAdditions-x86.exe
$ sudo apt update -y && sudo apt upgrade
$ sudo apt install dkms linux-headers-$(uname -r) build-essential  #Required packages
$ sudo sh /mnt/VBoxLinuxAdditions.run
$ systemctl reboot -i

To uninstall the guest additions run : sudo sh /mnt/VBoxLinuxAdditions.run uninstall

Useful aliases and functions

*For zsh, add source $HOME/.aliases in the .zshrc file`

# create a folder and immediately get in:
mkcd () {
    mkdir -p -- "$1" && cd -P -- "$1"
}
seurch () {
    cat ~/.bash_history | grep "$1"
}
alias ..='cd ../'
alias ...='cd ../../'
alias ....='cd ../../../'
alias .....='cd ../../../../'
alias ip='ip --color'

Disks details on Linux

Disk information

lsblk -l

source

Manual package installation

Debian

sudo dpkg -i package_name.deb

Add user to sudoers

usermod -aG sudo username

udp scan : sudo nmap -sU -sV - 10.10.11.124 --min-rate 7500 -F