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<a name="System-Information"></a>
Next: <a rel="next" accesskey="n" href="Hashing-Functions.html#Hashing-Functions">Hashing Functions</a>,
Previous: <a rel="previous" accesskey="p" href="Group-Database-Functions.html#Group-Database-Functions">Group Database Functions</a>,
Up: <a rel="up" accesskey="u" href="System-Utilities.html#System-Utilities">System Utilities</a>
<hr>
</div>
<h3 class="section">34.11 System Information</h3>
<!-- ./miscellaneous/computer.m -->
<p><a name="doc_002dcomputer"></a>
<div class="defun">
— Function File: [<var>c</var>, <var>maxsize</var>, <var>endian</var>] = <b>computer</b> ()<var><a name="index-computer-2442"></a></var><br>
<blockquote><p>Print or return a string of the form <var>cpu</var>-<var>vendor</var>-<var>os</var>
that identifies the kind of computer Octave is running on. If invoked
with an output argument, the value is returned instead of printed. For
example,
<pre class="example"> computer ()
-| i586-pc-linux-gnu
x = computer ()
x = "i586-pc-linux-gnu"
</pre>
<p>If two output arguments are requested, also return the maximum number
of elements for an array.
<p>If three output arguments are requested, also return the byte order
of the current system as a character (<code>"B"</code> for big-endian or
<code>"L"</code> for little-endian).
</p></blockquote></div>
<!-- syscalls.cc -->
<p><a name="doc_002duname"></a>
<div class="defun">
— Built-in Function: [<var>uts</var>, <var>err</var>, <var>msg</var>] = <b>uname</b> ()<var><a name="index-uname-2443"></a></var><br>
<blockquote><p>Return system information in the structure. For example,
<pre class="example"> uname ()
{
sysname = x86_64
nodename = segfault
release = 2.6.15-1-amd64-k8-smp
version = Linux
machine = #2 SMP Thu Feb 23 04:57:49 UTC 2006
}
</pre>
<p>If successful, <var>err</var> is 0 and <var>msg</var> is an empty string.
Otherwise, <var>err</var> is nonzero and <var>msg</var> contains a
system-dependent error message.
</p></blockquote></div>
<!-- ./miscellaneous/ispc.m -->
<p><a name="doc_002dispc"></a>
<div class="defun">
— Function File: <b>ispc</b> ()<var><a name="index-ispc-2444"></a></var><br>
<blockquote><p>Return 1 if Octave is running on a Windows system and 0 otherwise.
<!-- Texinfo @sp should work but in practice produces ugly results for HTML. -->
<!-- A simple blank line produces the correct behavior. -->
<!-- @sp 1 -->
<p class="noindent"><strong>See also:</strong> <a href="doc_002dismac.html#doc_002dismac">ismac</a>, <a href="doc_002disunix.html#doc_002disunix">isunix</a>.
</p></blockquote></div>
<!-- ./miscellaneous/isunix.m -->
<p><a name="doc_002disunix"></a>
<div class="defun">
— Function File: <b>isunix</b> ()<var><a name="index-isunix-2445"></a></var><br>
<blockquote><p>Return 1 if Octave is running on a Unix-like system and 0 otherwise.
<!-- Texinfo @sp should work but in practice produces ugly results for HTML. -->
<!-- A simple blank line produces the correct behavior. -->
<!-- @sp 1 -->
<p class="noindent"><strong>See also:</strong> <a href="doc_002dismac.html#doc_002dismac">ismac</a>, <a href="doc_002dispc.html#doc_002dispc">ispc</a>.
</p></blockquote></div>
<!-- ./miscellaneous/ismac.m -->
<p><a name="doc_002dismac"></a>
<div class="defun">
— Function File: <b>ismac</b> ()<var><a name="index-ismac-2446"></a></var><br>
<blockquote><p>Return 1 if Octave is running on a Mac OS X system and 0 otherwise.
<!-- Texinfo @sp should work but in practice produces ugly results for HTML. -->
<!-- A simple blank line produces the correct behavior. -->
<!-- @sp 1 -->
<p class="noindent"><strong>See also:</strong> <a href="doc_002dispc.html#doc_002dispc">ispc</a>, <a href="doc_002disunix.html#doc_002disunix">isunix</a>.
</p></blockquote></div>
<!-- sysdep.cc -->
<p><a name="doc_002disieee"></a>
<div class="defun">
— Built-in Function: <b>isieee</b> ()<var><a name="index-isieee-2447"></a></var><br>
<blockquote><p>Return 1 if your computer claims to conform to the IEEE standard for
floating point calculations.
</p></blockquote></div>
<!-- defaults.cc -->
<p><a name="doc_002dOCTAVE_005fHOME"></a>
<div class="defun">
— Built-in Function: <b>OCTAVE_HOME</b> ()<var><a name="index-OCTAVE_005fHOME-2448"></a></var><br>
<blockquote><p>Return the name of the top-level Octave installation directory.
</p></blockquote></div>
<!-- defaults.cc -->
<p><a name="doc_002dOCTAVE_005fVERSION"></a>
<div class="defun">
— Built-in Function: <b>OCTAVE_VERSION</b> ()<var><a name="index-OCTAVE_005fVERSION-2449"></a></var><br>
<blockquote><p>Return the version number of Octave, as a string.
</p></blockquote></div>
<!-- ./miscellaneous/license.m -->
<p><a name="doc_002dlicense"></a>
<div class="defun">
— Function File: <b>license</b><var><a name="index-license-2450"></a></var><br>
<blockquote><p>Display the license of Octave.
— Function File: <b>license</b> (<var>"inuse"</var>)<var><a name="index-license-2451"></a></var><br>
<blockquote><p>Display a list of packages currently being used.
— Function File: <var>retval</var> = <b>license</b> (<var>"inuse"</var>)<var><a name="index-license-2452"></a></var><br>
<blockquote><p>Return a structure containing the fields <code>feature</code> and <code>user</code>.
— Function File: <var>retval</var> = <b>license</b> (<var>"test", feature</var>)<var><a name="index-license-2453"></a></var><br>
<blockquote><p>Return 1 if a license exists for the product identified by the string
<var>feature</var> and 0 otherwise. The argument <var>feature</var> is case
insensitive and only the first 27 characters are checked.
— Function File: <b>license</b> (<var>"test", feature, toggle</var>)<var><a name="index-license-2454"></a></var><br>
<blockquote><p>Enable or disable license testing for <var>feature</var>, depending on
<var>toggle</var>, which may be one of:
<dl>
<dt>‘<samp><span class="samp">"enable"</span></samp>’<dd>Future tests for the specified license of <var>feature</var> are conducted
as usual.
<br><dt>‘<samp><span class="samp">"disable"</span></samp>’<dd>Future tests for the specified license of <var>feature</var> return 0.
</dl>
— Function File: <var>retval</var> = <b>license</b> (<var>"checkout", feature</var>)<var><a name="index-license-2455"></a></var><br>
<blockquote><p>Check out a license for <var>feature</var>, returning 1 on success and 0
on failure.
<p>This function is provided for compatibility with <span class="sc">matlab</span>.
<!-- Texinfo @sp should work but in practice produces ugly results for HTML. -->
<!-- A simple blank line produces the correct behavior. -->
<!-- @sp 1 -->
<p class="noindent"><strong>See also:</strong> <a href="doc_002dver.html#doc_002dver">ver</a>, <a href="doc_002dversion.html#doc_002dversion">version</a>.
</p></blockquote></div>
<!-- ./miscellaneous/version.m -->
<p><a name="doc_002dversion"></a>
<div class="defun">
— Function File: <b>version</b> ()<var><a name="index-version-2456"></a></var><br>
<blockquote><p>Return Octave's version number as a string. This is also the value of
the built-in variable <code>OCTAVE_VERSION</code><!-- /@w -->.
</p></blockquote></div>
<!-- ./miscellaneous/ver.m -->
<p><a name="doc_002dver"></a>
<div class="defun">
— Function File: <b>ver</b> ()<var><a name="index-ver-2457"></a></var><br>
<blockquote><p>Display a header containing the current Octave version
number, license string and operating system, followed by
the installed package names, versions, and installation
directories.
— Function File: v = <b>ver</b> ()<var><a name="index-ver-2458"></a></var><br>
<blockquote><p>Return a vector of structures, respecting Octave and each installed package.
The structure includes the following fields.
<dl>
<dt><code>Name</code><dd> Package name.
<br><dt><code>Version</code><dd> Version of the package.
<br><dt><code>Revision</code><dd> Revision of the package.
<br><dt><code>Date</code><dd> Date respecting the version/revision.
</dl>
— Function File: v = <b>ver</b> (<code>"Octave"</code>)<var><a name="index-ver-2459"></a></var><br>
<blockquote><p>Return version information for Octave only..
— Function File: v = <b>ver</b> (<var>pkg</var>)<var><a name="index-ver-2460"></a></var><br>
<blockquote><p>Return version information for the specified package <var>pkg</var>.
<!-- Texinfo @sp should work but in practice produces ugly results for HTML. -->
<!-- A simple blank line produces the correct behavior. -->
<!-- @sp 1 -->
<p class="noindent"><strong>See also:</strong> <a href="doc_002dlicense.html#doc_002dlicense">license</a>, <a href="doc_002dversion.html#doc_002dversion">version</a>.
</p></blockquote></div>
<!-- toplev.cc -->
<p><a name="doc_002doctave_005fconfig_005finfo"></a>
<div class="defun">
— Built-in Function: <b>octave_config_info</b> (<var>option</var>)<var><a name="index-octave_005fconfig_005finfo-2461"></a></var><br>
<blockquote><p>Return a structure containing configuration and installation
information for Octave.
<p>if <var>option</var> is a string, return the configuration information for the
specified option.
</blockquote></div>
<!-- ./DLD-FUNCTIONS/getrusage.cc -->
<p><a name="doc_002dgetrusage"></a>
<div class="defun">
— Loadable Function: <b>getrusage</b> ()<var><a name="index-getrusage-2462"></a></var><br>
<blockquote><p>Return a structure containing a number of statistics about the current
Octave process. Not all fields are available on all systems. If it is
not possible to get CPU time statistics, the CPU time slots are set to
zero. Other missing data are replaced by NaN. Here is a list of all
the possible fields that can be present in the structure returned by
<code>getrusage</code>:
<dl>
<dt><code>idrss</code><dd>Unshared data size.
<br><dt><code>inblock</code><dd>Number of block input operations.
<br><dt><code>isrss</code><dd>Unshared stack size.
<br><dt><code>ixrss</code><dd>Shared memory size.
<br><dt><code>majflt</code><dd>Number of major page faults.
<br><dt><code>maxrss</code><dd>Maximum data size.
<br><dt><code>minflt</code><dd>Number of minor page faults.
<br><dt><code>msgrcv</code><dd>Number of messages received.
<br><dt><code>msgsnd</code><dd>Number of messages sent.
<br><dt><code>nivcsw</code><dd>Number of involuntary context switches.
<br><dt><code>nsignals</code><dd>Number of signals received.
<br><dt><code>nswap</code><dd>Number of swaps.
<br><dt><code>nvcsw</code><dd>Number of voluntary context switches.
<br><dt><code>oublock</code><dd>Number of block output operations.
<br><dt><code>stime</code><dd>A structure containing the system CPU time used. The structure has the
elements <code>sec</code> (seconds) <code>usec</code> (microseconds).
<br><dt><code>utime</code><dd>A structure containing the user CPU time used. The structure has the
elements <code>sec</code> (seconds) <code>usec</code> (microseconds).
</dl>
</p></blockquote></div>
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