SSL certificates are used to secure our websites. Once we install SSL on our website, we should redirect all our website URL’s to its HTTPS version. There are many ways to redirect http to https. Redirect HTTP to HTTPS with Apache If we are having a user level access in an Apache server, .htaccess file […]

Pipe is a method for Inter Process Communication (IPC) which send output of one process to another process. As you know, pipes are of two types: Unnamed Pipes Named Pipes Unnamed Pipe An example of unnamed pipe is as follows: $ ls | wc -l Here output of first command is given as an input […]

SupportSages being a server management company, have witnessed the evolution of quite a few system administrators. In my personal opinion, out of all the qualities I have listed below, I personally believe, it is the ‘Never Say Die’ attitude and passion for continuous learning and exploring the system internals which makes one a great system […]

UDP is being a connectionless protocol, you can t reliably say that the port is open or not. Below two commands are the only way of checking the same. When you send a packet to the open port, there need not be any acknowledgment saying that the port is open. Theoretically, UDP should give a […]

Sed – The Stream Editor A stream editor is used to perform basic text transformations on an input file. Sed command is mainly used to replace the text in a file. But it is a powerful text processing tool. Some uses of sed command are explained below with examples: Consider the text file “test” as […]