---
title: About the os_env Resource
---

# os_env

Use the `os_env` InSpec audit resource to test the environment variables for the platform on which the system is running.

# Syntax

A `os_env` resource block declares an environment variable, and then declares its value:

    describe os_env('VARIABLE') do
      its('matcher') { should eq 1 }
    end

where

* `('VARIABLE')` must specify an environment variable, such as `PATH`
* `matcher` is a valid matcher for this resource


# Matchers

This InSpec audit resource has the following matchers:

## be

<%= partial "/shared/matcher_be" %>

## cmp

<%= partial "/shared/matcher_cmp" %>

## content

The `content` matcher return the value of the environment variable:

    its('content') { should eq '/usr/local/bin:/usr/local/sbin:/usr/sbin:/usr/bin:/sbin' }

## eq

<%= partial "/shared/matcher_eq" %>

## include

<%= partial "/shared/matcher_include" %>

## match

<%= partial "/shared/matcher_match" %>

## split

The `split` splits the content with the `:` deliminator:

    its('split') { should include (':') }

or:

    its('split') { should_not include ('.') }

Use `-1` to test for cases where there is a trailing colon (`:`), such as `dir1::dir2:`:

    its('split') { should include ('-1') }

# Examples

The following examples show how to use this InSpec audit resource.

## Test the PATH environment variable

    describe os_env('PATH') do
      its('split') { should_not include('') }
      its('split') { should_not include('.') }
    end

## Test Habitat environment variables

Habitat uses the `os_env` resource to test environment variables. The environment variables are first defined in a whitespace array, after which each environment variable is tested:

    hab_env_vars = %w(HAB_AUTH_TOKEN
                      HAB_CACHE_KEY_PATH
                      HAB_DEPOT_URL
                      HAB_ORG
                      HAB_ORIGIN
                      HAB_ORIGIN_KEYS
                      HAB_RING
                      HAB_RING_KEY
                      HAB_STUDIOS_HOME
                      HAB_STUDIO_ROOT
                      HAB_USER)

    hab_env_vars.each do |e|
      describe os_env(e) do
        its('content') { should eq nil }
      end
    end