isting implementations</h1>
<table border="1">
  <tbody><tr><th>Scheme implementation</th><th>get environment variable</th><th>get all the environment variables as an a-list</th></tr>
  <tr><td>Bigloo</td><td>(getenv name) =&gt; (or string? false) name:string?</td><td>&nbsp;</td></tr>
  <tr><td>CHICKEN</td><td>(getenv name) =&gt; (or string? false) name:string?</td><td>&nbsp;</td></tr>
  <tr><td>Gambit</td><td>(getenv name . &lt;default&gt;) =&gt;(or string? &lt;default&gt; &lt;Unbound OS environment variab