Just move the system versions shadowing Homebrew's versions out of the way: $ sudo mv /bin/vi /bin/vi-7.4
BREW INSTALL MACVIM OVERRIDE SYSTEM VIM SOFTWARE
Since all three of the directories in the prior solution are in the default user PATH on macOS, you don't actually need the symlinks unless you have local software that has hardcoded /bin or /usr/bin paths to vi or vim. Notice that this doesn't delete the OS-provided versions, just renames them so you still have access to them by appending -7.4 if you need to later. I do not recommend this solution, but it is what the original version of the question asked for, so there it is. Replace the OS's vi and vim binaries with symlinks to the Homebrew versions: $ cd /bin There are several ways to solve this problem: This is a general principle, not specific to Vi, Macs, or Homebrew at all: never place user-writeable PATH elements ahead of those that can only be modified by root. All they'd have to do is add some other common command here like ls, then pass the commands through to /bin/ls until they see you've run it through sudo, then they take over.
That permission change from the macOS default means that even an extremely unsophisticated malware could use this hole to get root privileges. While you could fix it by putting /usr/local/bin ahead of /usr/bin in the PATH, that would be a security hole since Homebrew gives ownership of that directory to your user. This is happening because the OS's vi is ahead of Homebrew vi in the PATH.
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