0 for 0.0.0.0 is useful too. I often do things like ping 0 or ssh 0 (perhaps with a different port number) to ssh into localhost. 0 expands to "0.0.0.0" and ca

0 for 0.0.0.0 is useful too. I often do things like ping 0 or ssh 0 (perhaps with a different port number) to ssh into localhost. 0 expands to "0.0.0.0" and can be used in place of localhost in many situations. (https://serverfault.com/questions/876698/whats-the-difference-in-localhost-vs-0-0-0-0 https://serverfault.com/questions/876698/whats-the-differenc...)