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<meta name="description" content="The i-th command-line argument.">
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-os.html">Os</a> <span>›</span> <span class="here">Os.arg</span></div>
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<span class="kind-badge kind-method">method</span>
<h1 id="top">Os.arg</h1>
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<code class="sig">Os.arg(i) -&gt; string</code>
<div class="desc"><p>The argument at index <code>i</code>. Index <code>0</code> is the program path; <code>1</code> onward are the launch arguments. Reading past <a href="os-arg_count"><code>arg_count()</code></a> is out of bounds.</p></div>
<div class="params"><h2>Parameters</h2><div class="param" id="param-i"><code class="pname">i</code><span class="pdesc">the argument index (0 = the program path)</span></div></div>
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Arg {
entry {
let prog = Os.arg(0) # the program path
print(len(prog))
}
}</pre></div>
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