The state of a port is either open, filtered, closed, or unfiltered. A port is said to be open if an application on the target machine is listening for connections/packets on that port. In this article, we will explain four ways to check open ports and also will show you how to find which application
Nano is a command line text editor, that comes preinstalled in almost every Linux distribution. It is often preferred by new users because of its simplicity, compared to other command line text editors such as vi/vim and emacs. It has plenty of useful features such as syntax coloring, line numbering, easy search and many others.
By default, all commands executed by Bash on the command line are stored in history buffer or recorded in a file called ~/.bash_history. This means that a system administrator can view a list of commands executed by users on the system or a user can view his/her command history using the history command like