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<p>&nbsp;<p>
<hr noshade size="5">
<h2><a name="ECHOon"></a>
ECHOon
</h2>

Switches the output of stdout to a file.

<p><p>

<h3>
Syntax:
</h3>
<pre>ECHOon ( name \| file [, arg] );</pre>

<p>

<table>
<tr>
<td>string</td>
<td><pre>  name  </pre></td>
<td>filename to write to</td>
</tr>
<tr>
<td>file</td>
<td><pre>  file  </pre></td>
<td>open for writing</td>
</tr>
<tr>
<td>expression</td>
<td><pre>  arg  </pre></td>
<td>should produce an output to stdout</td>
</tr>
</table>

<p>


See also:&nbsp;&nbsp;<a href="kashref.html#ECHOoff">ECHOoff</a>

<p>

<h3>
Description:
</h3>
Changes the output stream to output in a file. Note that it
is dangerous if an error occurs, because you will not be
able to see most of the kash messages. It is advisable to
use it only in the form:

\begin{center} <tt> ECHOon(file, arg); ECHOoff();</tt> \end{center}

because now kash will change back to normal behaviour even
if an error occurs. <tt> ECHOoff</tt> switches the indirection
off again. Note, that a call like

\begin{center} <tt> ECHOon(file);</tt> \end{center}

forces you to type all commands, including

\begin{center} <tt> ECHOoff();</tt> \end{center}

without any echo on the screen. All output is redirected to file.

<p><p>

<p>
<hr>
<p>
<h3>
Example:
</h3>
Debug information of an order maximal call. 
<pre>

kash> PRINTLEVEL ("ROUND2", 2);
2
kash> f := Open ("/tmp/dump","w");
Filename: /tmp/dump / Mode: w / Open (fid): 5
kash> ECHOon (f, OrderMaximal (Order (x^5 + 5*x^3 + 16*x^2 - 6*x + 38)));
   F[1]
    |
   F[2]
  /
 /
Q
F  [ 1]     Given by transformation matrix
F  [ 2]     x^5 + 5*x^3 + 16*x^2 - 6*x + 38
Discriminant: 3828384 

kash> Exec ("cat /tmp/dump");
kash> Close (f);
true

</pre>

<p>


<hr>

<p>
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