Git is really good at keeping a perfect history of the changes to your files. That's a great quality to have when those files are code, but not so great when a bit of application configuration slips in.

global-.gitignore

We need to create a global .gitignore in our home.

```
$> touch ~/.gitignore
$> git config --global core.excludesfile ~/.gitignore
```

After that we need to open (your) editor 

```
$> vim ~/.gitignore
```
and add at least the next lines (add as many as you need):

```
# Mac OS X hidden files
.DS_Store

# Vim swap files
.*.sw?

# Pow and Powder config
/.pow*

# RVM and rbenv
/.rvmrc
/.rbenv-version

# Bundler binstubs
/bin/
```

All Credits: http://devoh.com/blog/2013/01/global-gitignore