update to mark autocomplete function for mac os x found here: http://jeroenjanssens.com/2013/08/16/quickly-navigate-your-filesystem-from-the-command-line.html

_completemarks

_completemarks() {
  local curw=${COMP_WORDS[COMP_CWORD]}
  local wordlist=$(find $MARKPATH -type l | sed -En 's/(.*)\/.(marks)\/(.*)/\3/p')
  COMPREPLY=($(compgen -W '${wordlist[@]}' -- "$curw"))
  return 0
}