Cyber Security Enthusiast/Learner

Below is a simple python program in linux to see if a port is open or close. #!/usr/bin/python import socket ip = raw_input("Enter the IP Address: ") port = input("Enter the Port Number: ") sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) if sock.connect_ex((ip,port)):         print "Port",port, "is closed" else:         print "Port",port, "is open" We will use which python.py to know about the location of python, so we can use it in hash bang. next we are importing the socket library. taking as input and port are self explanatory. SOCKET constants and functions are used to get socket connected to sock variable. connect_ex will throw an exception if the port is closed , and we are utilizing it to display "the port is closed" else it will be open. make it executable and run,... I am not going into details, as there are many tutorials out there to learn the basics. CYB3RTR0N

I am learning Ethical hacking and penetration testing these days, and thought to write something in blog so that it can be helpful for others. So today i learned how to write a bash program to find active ips on your network. here is the program, i will explain it below. #!/bin/bash if [ "$1" == "" ] then echo "Usage: ./ping.sh [network]" echo "Example: ./ping.sh 192.168.1" else for x in {1..254} ; do ping -c 1 $1.$x |grep "64 bytes"|cut -d" " -f4|sed 's/.$//' done fi I won't go into the complete details , instead i am writing out only the problems i faced. first is the if command syntax , there is a space after if [ , it will give error if you write without space if[  The seq command somehow didn't worked for me, (i am using ubuntu 17), so i used {1..254}, this command will let the variable take one value at a time from 1 to 254 semi colon after the range is defined. must use a space after sed...