251 lines
8.4 KiB
HTML
251 lines
8.4 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>uncompress</title>
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="uncompress"></a> <a name="tag_04_155"></a><!-- uncompress -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_04_155_01"></a>NAME</h4>
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<blockquote>uncompress - expand compressed data</blockquote>
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<h4><a name="tag_04_155_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> uncompress</tt> <b>[</b><tt>-cfv</tt><b>][</b><i>file</i><tt>...</tt><b>]</b><tt><img src=
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"../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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</blockquote>
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<h4><a name="tag_04_155_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>uncompress</i> utility shall restore files to their original state after they have been compressed using the <a href=
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"../utilities/compress.html"><i>compress</i></a> utility. If no files are specified, the standard input shall be uncompressed to
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the standard output. If the invoking process has appropriate privileges, the ownership, modes, access time, and modification time
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of the original file shall be preserved.</p>
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<p>This utility shall support the uncompressing of any files produced by the <a href=
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"../utilities/compress.html"><i>compress</i></a> utility on the same implementation. For files produced by <a href=
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"../utilities/compress.html"><i>compress</i></a> on other systems, <i>uncompress</i> supports 9 to 14-bit compression (see <a href=
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"compress.html"><i>compress</i></a> , <b>-b</b>); it is implementation-defined whether values of <b>-b</b> greater than 14 are
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supported.</p>
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</blockquote>
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<h4><a name="tag_04_155_04"></a>OPTIONS</h4>
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<blockquote>
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<p>The <i>uncompress</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p>
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<p>The following options shall be supported:</p>
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<dl compact>
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<dt><b>-c</b></dt>
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<dd>Write to standard output; no files are changed.</dd>
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<dt><b>-f</b></dt>
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<dd>Do not prompt for overwriting files. Except when run in the background, if <b>-f</b> is not given the user shall be prompted as
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to whether an existing file should be overwritten. If the standard input is not a terminal and <b>-f</b> is not given,
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<i>uncompress</i> shall write a diagnostic message to standard error and exit with a status greater than zero.</dd>
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<dt><b>-v</b></dt>
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<dd>Write messages to standard error concerning the expansion of each file.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_155_05"></a>OPERANDS</h4>
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<blockquote>
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<p>The following operand shall be supported:</p>
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<dl compact>
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<dt><i>file</i></dt>
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<dd>A pathname of a file. If <i>file</i> already has the <b>.Z</b> suffix specified, it shall be used as the input file and the
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output file shall be named <b>file</b> with the <b>.Z</b> suffix removed. Otherwise, <i>file</i> shall be used as the name of the
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output file and <b>file</b> with the <b>.Z</b> suffix appended shall be used as the input file.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_155_06"></a>STDIN</h4>
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<blockquote>
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<p>The standard input shall be used only if no <i>file</i> operands are specified, or if a <i>file</i> operand is <tt>'-'</tt>
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.</p>
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</blockquote>
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<h4><a name="tag_04_155_07"></a>INPUT FILES</h4>
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<blockquote>
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<p>Input files shall be in the format produced by the <a href="../utilities/compress.html"><i>compress</i></a> utility.</p>
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</blockquote>
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<h4><a name="tag_04_155_08"></a>ENVIRONMENT VARIABLES</h4>
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<blockquote>
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<p>The following environment variables shall affect the execution of <i>uncompress</i>:</p>
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<dl compact>
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<dt><i>LANG</i></dt>
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<dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> for
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the precedence of internationalization variables used to determine the values of locale categories.)</dd>
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<dt><i>LC_ALL</i></dt>
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<dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd>
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<dt><i>LC_CTYPE</i></dt>
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<dd>Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as
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opposed to multi-byte characters in arguments).</dd>
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<dt><i>LC_MESSAGES</i></dt>
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<dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard
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error.</dd>
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<dt><i>NLSPATH</i></dt>
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<dd>Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i></dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_155_09"></a>ASYNCHRONOUS EVENTS</h4>
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<blockquote>
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<p>Default.</p>
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</blockquote>
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<h4><a name="tag_04_155_10"></a>STDOUT</h4>
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<blockquote>
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<p>When there are no <i>file</i> operands or the <b>-c</b> option is specified, the uncompressed output is written to standard
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output.</p>
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</blockquote>
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<h4><a name="tag_04_155_11"></a>STDERR</h4>
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<blockquote>
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<p>Prompts shall be written to the standard error output under the conditions specified in the DESCRIPTION and OPTIONS sections.
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The prompts shall contain the <i>file</i> pathname, but their format is otherwise unspecified. Otherwise, the standard error output
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shall be used only for diagnostic messages.</p>
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</blockquote>
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<h4><a name="tag_04_155_12"></a>OUTPUT FILES</h4>
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<blockquote>
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<p>Output files are the same as the respective input files to <a href="../utilities/compress.html"><i>compress</i></a>.</p>
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</blockquote>
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<h4><a name="tag_04_155_13"></a>EXTENDED DESCRIPTION</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_155_14"></a>EXIT STATUS</h4>
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<blockquote>
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<p>The following exit values shall be returned:</p>
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<dl compact>
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<dt> 0</dt>
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<dd>Successful completion.</dd>
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<dt>>0</dt>
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<dd>An error occurred.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_155_15"></a>CONSEQUENCES OF ERRORS</h4>
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<blockquote>
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<p>The input file remains unmodified.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_04_155_16"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The limit of 14 on the <a href="../utilities/compress.html"><i>compress</i></a> <b>-b</b> <i>bits</i> argument is to achieve
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portability to all systems (within the restrictions imposed by the lack of an explicit published file format). Some implementations
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based on 16-bit architectures cannot support 15 or 16-bit uncompression.</p>
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</blockquote>
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<h4><a name="tag_04_155_17"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_155_18"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_155_19"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_155_20"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="compress.html"><i>compress</i></a> , <a href="zcat.html"><i>zcat</i></a></p>
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</blockquote>
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<h4><a name="tag_04_155_21"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4.</p>
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</blockquote>
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<h4><a name="tag_04_155_22"></a>Issue 6</h4>
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<blockquote>
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<p>The normative text is reworded to avoid use of the term "must" for application requirements.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr>
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<hr size="2" noshade>
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<center><font size="2"><!--footer start-->
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
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"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
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]</font></center>
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