89e/src/core/os.c#L1540">source</a></span> <pre class="binding-text">(os/isatty &amp;opt file)

Returns true if `file` is a terminal. If `file` is not specified, it will default to standard output.</pre><a href="https://janetdocs.org/os/isatty">Community Examples</a></div><hr><div class="binding"><span id="os/link" class="binding-sym">os/link</span> <span class="binding-type">cfunction</span> <span class="binding-type"><a href="https://github.com/janet-lang/janet/blob/4e5889e/src/core/os.c#L1801">source</a>