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<title>The GNU Fortran Compiler: ISATTY</title>
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<a name="ISATTY-_002d_002d_002d-Whether-a-unit-is-a-terminal-device_002e"></a>
<h3 class="section">9.148 <code>ISATTY</code> &mdash; Whether a unit is a terminal device.</h3>
<a name="index-ISATTY"></a>
<a name="index-system_002c-terminal"></a>
<dl compact="compact">
<dt><em>Description</em>:</dt>
<dd><p>Determine whether a unit is connected to a terminal device.
</p>
</dd>
<dt><em>Standard</em>:</dt>
<dd><p>GNU extension
</p>
</dd>
<dt><em>Class</em>:</dt>
<dd><p>Function
</p>
</dd>
<dt><em>Syntax</em>:</dt>
<dd><p><code>RESULT = ISATTY(UNIT)</code>
</p>
</dd>
<dt><em>Arguments</em>:</dt>
<dd><table>
<tr><td width="15%"><var>UNIT</var></td><td width="70%">Shall be a scalar <code>INTEGER</code>.</td></tr>
</table>
</dd>
<dt><em>Return value</em>:</dt>
<dd><p>Returns <code>.TRUE.</code> if the <var>UNIT</var> is connected to a terminal
device, <code>.FALSE.</code> otherwise.
</p>
</dd>
<dt><em>Example</em>:</dt>
<dd><div class="smallexample">
<pre class="smallexample">PROGRAM test_isatty
INTEGER(kind=1) :: unit
DO unit = 1, 10
write(*,*) isatty(unit=unit)
END DO
END PROGRAM
</pre></div>
</dd>
<dt><em>See also</em>:</dt>
<dd><p><a href="TTYNAM.html#TTYNAM">TTYNAM</a>
</p></dd>
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