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<div class="refentry" title="system">
<a id="system"></a>
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<a id="Indexsystem_i" class="indexterm"></a>
<a id="Indexsystem" class="indexterm"></a>
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<h2>
<span class="refentrytitle">system</span>
</h2>
<p>system —
Call an external program via the system call
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp47018472"></a>
<h2>Description</h2>
<p>
<span class="command"><strong>system</strong></span> and <span class="command"><strong>system_i</strong></span> call
any external command understood by the operating system, similarly
to the C function system(). <span class="command"><strong>system_i</strong></span> runs
at i-time only, while
<span class="command"><strong>system</strong></span> runs both at initialization and
performance time.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp47020808"></a>
<h2>Syntax</h2>
<pre class="synopsis">ires <span class="command"><strong>system_i</strong></span> itrig, Scmd, [inowait]</pre>
<pre class="synopsis">kres <span class="command"><strong>system</strong></span> ktrig, Scmd, [knowait]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp47022680"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>Scmd</em></span> -- command string
</p>
<p>
<span class="emphasis"><em>itrig</em></span> -- if greater than zero the opcode
performs the printing; otherwise it is an null operation.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp47024176"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ktrig</em></span> -- if greater than zero and different
from the value on the previous control cycle the opcode
performs the requested printing. Initially this previous value is
taken as zero.
</p>
<p>
<span class="emphasis"><em>inowait,knowait</em></span> -- if given an non zero the
command is run in the background and the command does not wait
for the result. (default = 0)
</p>
<p>
<span class="emphasis"><em>ires, kres</em></span> -- the return code of the
command in wait mode and if the command is run.In other cases
returns zero.
</p>
<p>
More than one system command (a script) can be executed with a single <span class="command"><strong>system</strong></span> opcode by using double braces strings {{ }}.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
This opcode is very system dependant, so should be used with extreme care (or not used) if platform neutrality is desired.
</td>
</tr>
</table>
</div>
</div>
<div class="refsect1" title="Example">
<a id="idp47027624"></a>
<h2>Example</h2>
<p>
Here is an example of the system_i opcode. It uses the file <a class="ulink" href="examples/system.csd" target="_top"><em class="citetitle">system.csd</em></a>.
</p>
<div class="example">
<a id="idp47028600"></a>
<p class="title">
<strong>Example 845. Example of the system opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in</span>
-odac <span class="comment">; -iadc ;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o system.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
<span class="comment">; Waits for command to execute before continuing</span>
ires <span class="opc">system_i</span> 1,{{ ps
<span class="opc">date</span>
cd <span class="op">~</span><span class="op">/</span>Desktop
pwd
ls <span class="op">-</span>l
whois csounds.com
}}
<span class="opc">print</span> ires
<span class="opc">turnoff</span>
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2
<span class="comment">; Runs command in a separate thread</span>
ires <span class="opc">system_i</span> 1,{{ ps
<span class="opc">date</span>
cd <span class="op">~</span><span class="op">/</span>Desktop
pwd
ls <span class="op">-</span>l
whois csounds.com
}}, 1
<span class="opc">print</span> ires
<span class="opc">turnoff</span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for thirty seconds.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">i</span> 2 5 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp47030888"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>2007</td>
</tr>
</table>
<p>
</p>
<p>New in version 5.06</p>
<p>
</p>
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