how do I detect OS X in my .vimrc file, so certain configurations will only apply to OS X?

Question

My updated .vimrc now uses the following:

if has("gui_running")
  " Gvim
  if has("gui_gtk2") || has("gui_gtk3")
    " Linux GUI
  elseif has("gui_win32")
    " Win32/64 GVim
  elseif has("gui_macvim")
    " MacVim
  else
    echo "Unknown GUI system!!!!"
  endif
else
  " Terminal vim
endif

My original answer is below

You could try what I do in my .vimrc:

if has("unix")
  let s:uname = system("uname -s")
  if s:uname == "Darwin"
    " Do Mac stuff here
  endif
endif

Although, to be completely transparent, my actual .vimrc reads:

let s:uname = system("echo -n \"$(uname)\"")
if !v:shell_error && s:uname == "Linux"

Mainly for detecting Linux (as opposed to OSX)

I’m not sure if you absolutely have to do that echo -n \"$(uname)\" stuff, but it had to do with the newline at the end of the uname call. Your mileage may vary.

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