Introduction : Nmap ("Network Mapper") is a free and open source ( license ) utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. It was designed to rapidly scan large networks, but works fine against single hosts. Nmap runs on all major computer operating systems, and official binary packages are available for Linux, Windows, and Mac OS X.
In this article we give you the most as often as possible used Linux Commands. Coming from the solace of a PC or Mac work area, the Linux Command Line looks not at all like what you regularly utilize. For somebody to work in the Terminal they have to acquaint themselves with Linux commands. The Linux Command line is very helpful, fundamental to utilizing your Linux or VM and if done right, it furnishes you with more understanding and handy use than the Windows or Mac work area ever could. System Linux Commands Command Uses uname Displays linux system information cat /etc/redhat_release Displays which version of redhat installed uptime Display how long the system has been running hostname Display system host name last reboot Display system reboot history date Display the current date and time cal Display the calendar of the current month w Displays who is logged on whoami Displays current user id finger user Displays information about user reboot Rebo...