Apologies but I am new to the whole UNIX/Mac command line.
I have MacVim installed and I am trying to set it up as the editor for Git (version control). But I can't run 'mvim' from the command line as it isn't recognised. I don't see an option in MacVim to do this for me. I am guessing I need to edit a PATH variable on the Mac?
There should be a script named mvim in the root of the .bz2 file. Copy this somewhere into your $PATH ( /usr/local/bin would be good ) and you should be sorted.
I'd seriously recommend installing MacVim via MacPorts (sudo port install MacVim).
When installed, MacPorts automatically updates your profile to include /opt/local/bin in your path, and so when mvim is installed as /opt/local/bin/mvim during the install of MacVim you'll find it ready to use straight away.
When you install the MacVim port the MacVim.app bundle is installed in /Applications/MacPorts for you too.
A good thing about going the MacPorts route is that you'll also be able to install git too (sudo port install git-core) and many many other ports. Highly recommended.
In addition, if you want to use MacVim as $EDITOR, you should be aware that by default MacVim will not wait for a return value, which will confuse your source control program. export EDITOR='mvim -f' should give you what you want.
-steve