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<title>6.1.6 Miscellaneous System Information </title>
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<H2>
<BR>
6.1.6 Miscellaneous System Information 
</H2>

<P>
<dl><dt><b><a name='l2h-1015'><tt class='function'>confstr</tt></a></b> (<var>name</var>)
<dd>
Return string-valued system configuration values.
<var>name</var> specifies the configuration value to retrieve; it may be a
string which is the name of a defined system value; these names are
specified in a number of standards (POSIX, Unix95, Unix98, and
others).  Some platforms define additional names as well.  The names
known to the host operating system are given in the
<code>confstr_names</code> dictionary.  For configuration variables not
included in that mapping, passing an integer for <var>name</var> is also
accepted.
Availability: Unix.

<P>
If the configuration value specified by <var>name</var> isn't defined, the
empty string is returned.

<P>
If <var>name</var> is a string and is not known, <tt class="exception">ValueError</tt> is
raised.  If a specific value for <var>name</var> is not supported by the
host system, even if it is included in <code>confstr_names</code>, an
<tt class="exception">OSError</tt> is raised with <tt class="constant">errno.EINVAL</tt> for the
error number.
</dl>

<P>
<dl><dt><b><a name='l2h-1016'><tt>confstr_names</tt></a></b>
<dd>
Dictionary mapping names accepted by <tt class="function">confstr()</tt> to the
integer values defined for those names by the host operating system.
This can be used to determine the set of names known to the system.
Availability: Unix.
</dl>

<P>
<dl><dt><b><a name='l2h-1017'><tt class='function'>sysconf</tt></a></b> (<var>name</var>)
<dd>
Return integer-valued system configuration values.
If the configuration value specified by <var>name</var> isn't defined,
<code>-1</code> is returned.  The comments regarding the <var>name</var>
parameter for <tt class="function">confstr()</tt> apply here as well; the dictionary
that provides information on the known names is given by
<code>sysconf_names</code>.
Availability: Unix.
</dl>

<P>
<dl><dt><b><a name='l2h-1018'><tt>sysconf_names</tt></a></b>
<dd>
Dictionary mapping names accepted by <tt class="function">sysconf()</tt> to the
integer values defined for those names by the host operating system.
This can be used to determine the set of names known to the system.
Availability: Unix.
</dl>

<P>
The follow data values are used to support path manipulation
operations.  These are defined for all platforms.

<P>
Higher-level operations on pathnames are defined in the
<tt class='module'><a href="module-os.path.html" tppabs="http://www.python.org/doc/current/lib/module-os.path.html">os.path</a></tt> module.

<P>
<dl><dt><b><a name='l2h-1019'><tt>curdir</tt></a></b>
<dd>
The constant string used by the OS to refer to the current directory,
e.g. <code>'.'</code> for POSIX or <code>':'</code> for the Macintosh.
</dl>

<P>
<dl><dt><b><a name='l2h-1020'><tt>pardir</tt></a></b>
<dd>
The constant string used by the OS to refer to the parent directory,
e.g. <code>'..'</code> for POSIX or <code>'::'</code> for the Macintosh.
</dl>

<P>
<dl><dt><b><a name='l2h-1021'><tt>sep</tt></a></b>
<dd>
The character used by the OS to separate pathname components,
e.g. "<tt class="character">/</tt>" for POSIX or "<tt class="character">:</tt>" for the Macintosh.
Note that knowing this is not sufficient to be able to parse or
concatenate pathnames -- use <tt class="function">os.path.split()</tt> and
<tt class="function">os.path.join()</tt> -- but it is occasionally useful.
</dl>

<P>
<dl><dt><b><a name='l2h-1022'><tt>altsep</tt></a></b>
<dd>
An alternative character used by the OS to separate pathname components,
or <code>None</code> if only one separator character exists.  This is set to
"<tt class="character">/</tt>" on DOS and Windows systems where <code>sep</code> is a backslash.
</dl>

<P>
<dl><dt><b><a name='l2h-1023'><tt>pathsep</tt></a></b>
<dd>
The character conventionally used by the OS to separate search patch
components (as in <a class="envvar" name='l2h-1026'>$PATH</a>), e.g. "<tt class="character">:</tt>" for POSIX or
"<tt class="character">;</tt>" for DOS and Windows.
</dl>

<P>
<dl><dt><b><a name='l2h-1024'><tt>defpath</tt></a></b>
<dd>
The default search path used by <tt class="function">exec*p*()</tt> if the environment
doesn't have a <code>'PATH'</code> key.
</dl>

<P>
<dl><dt><b><a name='l2h-1025'><tt>linesep</tt></a></b>
<dd>
The string used to separate (or, rather, terminate) lines on the
current platform.  This may be a single character,
e.g. <code>'&#92;n'</code> for POSIX or <code>'&#92;r'</code> for MacOS, or multiple
characters, e.g. <code>'&#92;r&#92;n'</code> for MS-DOS and MS Windows.
</dl>

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