Create gitignore_global
printf ".DS_Store\nTemplateIcon.icns\n*.swp\n*~.nib\nbuild/\n*.git/\n*.svn/\n*.pbxuser\n*.perspective\n*.perspectivev3\n*.mode1v3\n*.mode2v3\n" > .gitignore_global
printf ".hg*\n" >> .gitignore_global
git config --global core.excludesfile '~/.gitignore_global'