| <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>env</title><link rel="stylesheet" type="text/css" href="rivet.css"><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="index.html" title="Apache Rivet 3.2"><link rel="up" href="commands.html" title="Rivet Tcl Commands and Variables"><link rel="prev" href="debug.html" title="debug"><link rel="next" href="escape_sgml_chars.html" title="escape_sgml_chars"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">env</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="debug.html"><img src="images/prev.png" alt="Prev"></a> </td><th width="60%" align="center">Rivet Tcl Commands and Variables</th><td width="20%" align="right"> <a accesskey="n" href="escape_sgml_chars.html"><img src="images/next.png" alt="Next"></a></td></tr></table></div><div class="refentry"><div class="refentry.separator"><hr></div><a name="env"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>env — | |
| Returns the value a single "environmental variable". | |
| </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::env</span> ?<span style="font-family:monospace; font-weight: bold;"><em class="replaceable"><code>environment_variable_name</code></em></span>?</div></div></div><div class="refsect1"><a name="idm1100"></a><h2>Description</h2><p style="width:90%"> | |
| <span style="font-family:monospace"><span class="command"><strong>::rivet::env</strong></span></span> resolves a single environment | |
| variable and returns its value or an empty string if the environment | |
| variable name in the argument is not defined. | |
| This command is the recommended way to resolve an environment | |
| variable leaving <span style="font-family:monospace"><span class="command"><strong>::rivet::load_env</strong></span></span> to debugging | |
| and development operations. | |
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