1. head file.txt : head command displays fisrt 10 lines of the text file.

eg : Create a text file and give any content for about 25 lines. Now enter : head

2. head -5 file.txt : this command is used to display the specific number of lines from the text file.

3. nl file.txt : this command displays the contents along with the numbering.

4. cd (dir.name) && ls : this && symbol combines the two commands and performs at the same time.

1. ps : lists processes running in background.

2. ps aux : lists the used processes. It also displays:

   USER : user who invoked the process PID : process ID %CPU : displays the used percentage of CPU in the process. %MEM : displays the used percentage of memory in the process. COMMAND : name of command that started the process.

1. find command :

     find command started at the top of the file system(/), went through every directory looking for apache2 in the file name, and then listed all the instances found.

2. ps aux | grep apache

TBomb is a free and open-source tool available on GitHub which is used to perform call and SMS bombing on the target phone number. This is the best tool for performing pranks on someone. This tool is written in python, so you must have python installed in your kali linux operating system.

 1. Search TBomb tool in github and download the tool using gitclone.
 2. After installation 
 ## python --version
 ## sudo apt install git
 ## gitclone https://github.com/TheSpeedX/TBomb.git
 ## cd tbomb
 ## bash TBomb.sh

 3. Select attack type enter the victim mobile number also select the number of times