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### 34.11 System Information

— Function File: [c, maxsize, endian] = computer ()

> Print or return a string of the form cpu-vendor-os 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,

>               computer ()
>                    -| i586-pc-linux-gnu

>               x = computer ()
>                     x = "i586-pc-linux-gnu"

> If two output arguments are requested, also return the maximum number of elements for an array.

> If three output arguments are requested, also return the byte order of the current system as a character (`"B"` for big-endian or `"L"` for little-endian).

— Built-in Function: [uts, err, msg] = uname ()

> Return system information in the structure. For 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
>                        }

> If successful, err is 0 and msg is an empty string. Otherwise, err is nonzero and msg contains a system-dependent error message.

— Function File: ispc ()

> Return 1 if Octave is running on a Windows system and 0 otherwise.

> See also: ismac, isunix.

— Function File: isunix ()

> Return 1 if Octave is running on a Unix-like system and 0 otherwise.

> See also: ismac, ispc.

— Function File: ismac ()

> Return 1 if Octave is running on a Mac OS X system and 0 otherwise.

> See also: ispc, isunix.

— Built-in Function: isieee ()

> Return 1 if your computer claims to conform to the IEEE standard for floating point calculations.

— Built-in Function: OCTAVE_HOME ()

> Return the name of the top-level Octave installation directory.

— Built-in Function: OCTAVE_VERSION ()

> Return the version number of Octave, as a string.

— Function File: license

> Display the license of Octave. — Function File: license ("inuse")

> > Display a list of packages currently being used. — Function File: retval = license ("inuse")

> > > Return a structure containing the fields `feature` and `user`. — Function File: retval = license ("test", feature)

> > > > Return 1 if a license exists for the product identified by the string feature and 0 otherwise. The argument feature is case insensitive and only the first 27 characters are checked. — Function File: license ("test", feature, toggle)

> > > > > Enable or disable license testing for feature, depending on toggle, which may be one of:

> > > > > ‘`"enable"`’
> > > > >   Future tests for the specified license of feature are conducted as usual.
> > > > > ‘`"disable"`’
> > > > >   Future tests for the specified license of feature return 0.
> > > > > — Function File: retval = license ("checkout", feature)

> > > > > > Check out a license for feature, returning 1 on success and 0 on failure.

> > > > > > This function is provided for compatibility with matlab.

> > > > > > See also: ver, version.

— Function File: version ()

> Return Octave's version number as a string. This is also the value of the built-in variable `OCTAVE_VERSION`.

— Function File: ver ()

> 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 = ver ()

> > Return a vector of structures, respecting Octave and each installed package. The structure includes the following fields.

> > `Name`
> >   Package name.
> > `Version`
> >   Version of the package.
> > `Revision`
> >   Revision of the package.
> > `Date`
> >   Date respecting the version/revision.
> > — Function File: v = ver (`"Octave"`)

> > > Return version information for Octave only.. — Function File: v = ver (pkg)

> > > > Return version information for the specified package pkg.

> > > > See also: license, version.

— Built-in Function: octave_config_info (option)

> Return a structure containing configuration and installation information for Octave.

> if option is a string, return the configuration information for the specified option.

— Loadable Function: getrusage ()

> 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 `getrusage`:

> `idrss`
>   Unshared data size.
> `inblock`
>   Number of block input operations.
> `isrss`
>   Unshared stack size.
> `ixrss`
>   Shared memory size.
> `majflt`
>   Number of major page faults.
> `maxrss`
>   Maximum data size.
> `minflt`
>   Number of minor page faults.
> `msgrcv`
>   Number of messages received.
> `msgsnd`
>   Number of messages sent.
> `nivcsw`
>   Number of involuntary context switches.
> `nsignals`
>   Number of signals received.
> `nswap`
>   Number of swaps.
> `nvcsw`
>   Number of voluntary context switches.
> `oublock`
>   Number of block output operations.
> `stime`
>   A structure containing the system CPU time used. The structure has the elements `sec` (seconds) `usec` (microseconds).
> `utime`
>   A structure containing the user CPU time used. The structure has the elements `sec` (seconds) `usec` (microseconds).