MacOS – mupdf command does not install with homebrew

which is an external program, which tries to determine how your shell will resolve a command from the existing $PATH, but it is possible for it to get it wrong.

If you're using bash as your shell, use the bash built-in command "type" to have the shell itself tell you how it will resolve that command:

$ which mvn
/usr/bin/mvn
$ type mvn
mvn is /usr/bin/mvn
$ type type
type is a shell builtin
$ type which
which is hashed (/usr/bin/which)

You can see here that in my environment that /usr/bin/which and the shell built-in type agree. In yours it seems they don't, though I am curious why they don't. Perhaps you have PATH changes that were not exported? Try "export PATH" and then "which mvn" again.

Seems that you have problems connecting to github via https.

While I'm not sure what could cause it and how to fix it, you still can use git with another protocol.

Here's the commands to install homebrew in /usr/local/ from scratch using git:// instead of https://:

cd /usr/local/
git init -q
git remote add origin git://github.com/mxcl/homebrew
git fetch origin master:refs/remotes/origin/master -n
git reset --hard origin/master

That should work. Please notice that if you choose to use another directory for homebrew, you probably will have to append its ./bin directory to your environment PATH variable for comfortable usage.