![]() So far as we can tell, however, the command above is all that’s actually necessary. ![]() Some sites claim you need to run more commands than this on High Sierra, for example, while others make this command unnecessarily long. There’s a lot of conflicting information on the web about this procedure. Obviously you don’t need to know all of the rest of that. nohup is a command to make a command ignore the signal. Many daemons will reload their configuration files and reopen their logfiles instead of exiting when receiving this signal. In modern systems, this signal usually means that the controlling pseudo or virtual terminal has been closed. It was originally designed to notify the process of a serial line drop (a hangup). The SIGHUP signal is sent to a process when its controlling terminal is closed. ![]() So, what does this command actually do? What’s happening here is that you’re kind of tricking your system into flushing the cache. Wikipedia explains: To clear your DNS cache on your Mac, open the Terminal, which you can find in Applications > Utilities or by searching with Spotlight, and then run the following command: sudo killall -HUP mDNSResponder
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