PHP is an open source and powerful server side scripting language, can run in Windows, Linux, Mac and other operating system. Some very useful functions are becomes dangerous function because hackers easily hacked websites in hosting servers..

If you are using windows server 2012 or 2008, can start or stop w3svc service on command prompt,

CSF is very helpful to allow or deny certain IP address with port in your Linux server. Based on your require block or allowing IP address with Port.

VSFTPD is an open source for uploading files to a server. Its very fast and secure files transfer.

Opera browser is an open source and have powerful features. This help us stay online when your internet connection is slow.

Run level 3 is set to multi-user.target and run level 5 is set to graphical.target.

Systemctl tool is use to start, stop, restart, status basic services, also the functionality of both service and chkconfig.