Shell script to flush the DNS cache for various flavors of OS X

flush-dns

Installing and uninstalling this is easy. Just download the latest release from https://github.com/nbcarey/flush-dns-osx/releases. The easiest way to unpack it is via the finder. Just double-click on the *.zip or *.tar.gz file and let the Finder do its thing.

Then open a command shell, cd down to the unpacked directory and run

• sudo make install to install it, or
• sudo make uninstall to uninstall it.

If you don't have make installed, you need to run these commands to install it:

sudo cp ./flush-dns.sh /usr/local/bin/flush-dns
sudo chmod 0755 /usr/local/bin/flush-dns
sudo chown root:wheel /usr/local/bin/flush-dns

To remove it:

sudo rm /usr/local/bin/flush-dns

• http://osxdaily.com/2008/03/21/how-to-flush-your-dns-cache-in-mac-os-x/
• http://osxdaily.com/2014/11/20/flush-dns-cache-mac-os-x/
• http://osxdaily.com/2015/11/16/howto-flush-dns-cache-os-x-elcap/
• http://osxdaily.com/2017/03/08/clear-dns-cache-macos-sierra/