265 lines
9.9 KiB
HTML
265 lines
9.9 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>uudecode</title>
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</head>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="uudecode"></a> <a name="tag_04_162"></a><!-- uudecode -->
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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_162_01"></a>NAME</h4>
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<blockquote>uudecode - decode a binary file</blockquote>
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<h4><a name="tag_04_162_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('UP')">UP</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> uudecode</tt> <b>[</b><tt>-o</tt> <i>outfile</i><b>][</b><i>file</i><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_162_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>uudecode</i> utility shall read a file, or standard input if no file is specified, that includes data created by the <a
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href="../utilities/uuencode.html"><i>uuencode</i></a> utility. The <i>uudecode</i> utility shall scan the input file, searching for
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data compatible with one of the formats specified in <a href="../utilities/uuencode.html"><i>uuencode</i></a>, and attempt to
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create or overwrite the file described by the data (or overridden by the <b>-o</b> option). The pathname shall be contained in the
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data or specified by the <b>-o</b> option. The file access permission bits and contents for the file to be produced shall be
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contained in that data. The mode bits of the created file (other than standard output) shall be set from the file access permission
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bits contained in the data; that is, other attributes of the mode, including the file mode creation mask (see <a href=
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"umask.html"><i>umask</i>()</a> ), shall not affect the file being produced.</p>
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<p>If the pathname of the file to be produced exists, and the user does not have write permission on that file, <i>uudecode</i>
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shall terminate with an error. If the pathname of the file to be produced exists, and the user has write permission on that file,
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the existing file shall be overwritten.</p>
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<p>If the input data was produced by <a href="../utilities/uuencode.html"><i>uuencode</i></a> on a system with a different number
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of bits per byte than on the target system, the results of <i>uudecode</i> are unspecified.</p>
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</blockquote>
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<h4><a name="tag_04_162_04"></a>OPTIONS</h4>
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<blockquote>
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<p>The <i>uudecode</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 option shall be supported by the implementation:</p>
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<dl compact>
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<dt><b>-o </b> <i>outfile</i></dt>
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<dd>A pathname of a file that shall be used instead of any pathname contained in the input data. Specifying an <i>outfile</i>
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option-argument of <b>/dev/stdout</b> shall indicate standard output.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_162_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>The pathname of a file containing the output of <a href="../utilities/uuencode.html"><i>uuencode</i></a>.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_162_06"></a>STDIN</h4>
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<blockquote>
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<p>See the INPUT FILES section.</p>
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</blockquote>
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<h4><a name="tag_04_162_07"></a>INPUT FILES</h4>
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<blockquote>
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<p>The input files shall be files containing the output of <a href="../utilities/uuencode.html"><i>uuencode</i></a>.</p>
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</blockquote>
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<h4><a name="tag_04_162_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>uudecode</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 and input files).</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><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i> <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_162_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_162_10"></a>STDOUT</h4>
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<blockquote>
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<p>If the file data header encoded by <a href="../utilities/uuencode.html"><i>uuencode</i></a> is <b>-</b> or <b>/dev/stdout</b>,
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or the <b>-o</b> <b>/dev/stdout</b> option overrides the file data, the standard output shall be in the same format as the file
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originally encoded by <a href="../utilities/uuencode.html"><i>uuencode</i></a>. Otherwise, the standard output shall not be
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used.</p>
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</blockquote>
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<h4><a name="tag_04_162_11"></a>STDERR</h4>
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<blockquote>
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<p>The standard error shall be used only for diagnostic messages.</p>
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</blockquote>
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<h4><a name="tag_04_162_12"></a>OUTPUT FILES</h4>
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<blockquote>
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<p>The output file shall be in the same format as the file originally encoded by <a href=
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"../utilities/uuencode.html"><i>uuencode</i></a>.</p>
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</blockquote>
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<h4><a name="tag_04_162_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_162_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_162_15"></a>CONSEQUENCES OF ERRORS</h4>
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<blockquote>
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<p>Default.</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_162_16"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The user who is invoking <i>uudecode</i> must have write permission on any file being created.</p>
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<p>The output of <a href="../utilities/uuencode.html"><i>uuencode</i></a> is essentially an encoded bit stream that is not
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cognizant of byte boundaries. It is possible that a 9-bit byte target machine can process input from an 8-bit source, if it is
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aware of the requirement, but the reverse is unlikely to be satisfying. Of course, the only data that is meaningful for such a
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transfer between architectures is generally character data.</p>
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</blockquote>
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<h4><a name="tag_04_162_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_162_18"></a>RATIONALE</h4>
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<blockquote>
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<p>Input files are not necessarily text files, as stated by an early proposal. Although the <a href=
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"../utilities/uuencode.html"><i>uuencode</i></a> output is a text file, that output could have been wrapped within another file or
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mail message that is not a text file.</p>
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<p>The <b>-o</b> option is not historical practice, but was added at the request of WG15 so that the user could override the target
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pathname without having to edit the input data itself.</p>
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<p>In early drafts, the [ <b>-o</b> <i>outfile</i>] option-argument allowed the use of <b>-</b> to mean standard output. The symbol
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<b>-</b> has only been used previously in IEEE Std 1003.1-2001 as a standard input indicator. The developers of the
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standard did not wish to overload the meaning of <b>-</b> in this manner. The <b>/dev/stdout</b> concept exists on most modern
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systems. The <b>/dev/stdout</b> syntax does not refer to a new special file. It is just a magic cookie to specify standard
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output.</p>
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</blockquote>
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<h4><a name="tag_04_162_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_162_20"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="umask.html"><i>umask</i>()</a> , <a href="uuencode.html"><i>uuencode</i></a></p>
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</blockquote>
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<h4><a name="tag_04_162_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_162_22"></a>Issue 6</h4>
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<blockquote>
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<p>This utility is marked as part of the User Portability Utilities option.</p>
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<p>The <b>-o</b> <i>outfile</i> option is added, as specified in the IEEE P1003.2b draft standard.</p>
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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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<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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