Kali and Linux

•  Default login:
  kali
  kali

• Basic Linux Commands:
  pwd
  cd
  ls
  mkdir, rmdir
  cp, rm, mv, locate
  updatedb
  passwd
  man
  
  

         echo "Hi!" > test.txt

• Commands
  chmod
  adduser
  /etc/passwd,/etc/shadow
  su    (switch user)
  sudo 
  
  ifconfig
  iwconfig
  arp
  netstat
  route
  
  
• View, create and edit files
  echo
     echo "Hi!" > test.txt
  cat
  replacing vs appending (> vs >>)
  touch 
  nano  vi or vim)
  gedit (N/A)
  
  
• start and stop Kali Services
  services
     service apache2 start/stop
     alternative to launch a webserver to transfer file, run in a directory, then from browser will see directory file list
     python -m SimpleHTTPServer [portnumber]
  
  systemctl  (start server permanently)
  systemctl enable ssh
  systemctl enable postgresql
  
  
• Installing
  installing updates with apt-get
     apt-get update && apt-get upgrade
     apt-get install git
   or tools with apt-get
  git  (github)
  
  
• script
  grep
  cut
  tr
  script writing
  for loops
  
  example:
  ping 192.168.2.1 -c 1 > ip.txt
  cat ip.txt
  cat ip.txt | grep "64 bytes"
  cat ip.txt | grep "64 bytes" | cut -d " " -f 4      (-d delimiter, -f field)
  cat ip.txt | grep "64 bytes" | cut -d " " -f 4 | tr -d ":" 
  
  

#! /bin/bash
if [ "$1" == "" ]
then
echo "you forgot an ip address"
echo "Syntax:  ./ipsweep.sh 192.168.1"
else
for ip in `seq 1 254` ; do
ping -c 1 $1.$ip | grep "64 bytes" | cut -d " " -f 4 | tr -d ":" &
done
fi

./ipsweep.sh 192.168.2 > iplist.txt

for ip in $(cat iplist.txt); do nmap -sS -p80 -T4 $ip & done

https://www.thecybermentor.com/

https://www.hackthebox.com/

https://www.virtualhackinglabs.com/

https://www.vulnhub.com/

Nessus

======Linux=====

Sudo stands for SuperUser DO and is used to access restricted files and operations. By default, Linux restricts access to certain parts of the system preventing sensitive files from being compromised.

The sudo command temporarily elevates privileges allowing users to complete sensitive tasks without logging in as the root user.

back to last directory I was 

cd -      

back to home directory

cd ~

clear screen
clear or Ctrl+L

Backgroup and frontgroup

Example, when in vi, need switch to terminal, Ctrl+Z, in Terminal, type fg to go back vi

call back last command with sudo 

sudo !!

History commands
history
!xxx