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Add Get The Value Of An Environment Variable as a clojure til.

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2015-11-19 20:35:57 -06:00
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# Get The Value Of An Environment Variable
You can get the value of an environment variable on your system using the
`System/getenv` function. Just pass it the environment variable as a string:
```clojure
> (System/getenv "HOME")
"/Users/jbranchaud"
```
It returns `nil` when the environment variable doesn't exist.
```clojure
> (System/getenv "HOUSE")
nil
```