This article just seems silly. As many have mentioned nobody is using telnet to check multiple ports (outside of a handful). If you need to "automate" checking

This article just seems silly. As many have mentioned nobody is using telnet to check multiple ports (outside of a handful). If you need to "automate" checking ports, nmap has always been the tool. The choice between telnet and netcat has just been personally preference or availability. I also hate the title of this article, really sick of seeing "Stop using X".