2007-03-02 19:27:56 +00:00
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Licensed to the Apache Software Foundation (ASF) under one or more
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The ASF licenses this file to You under the Apache License, Version 2.0
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the License. You may obtain a copy of the License at
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Unless required by applicable law or agreed to in writing, software
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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<title>Truncate Task</title>
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</head>
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<body>
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<h2><a name="touch">Truncate</a></h2>
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<h3>Description</h3>
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<p>Set the length of one or more files, as the intermittently available
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<code>truncate</code> Unix utility/function. In addition to working with
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a single file, this Task can also work on
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<a href="../CoreTypes/resource.html">resources</a> and resource collections.
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<strong>Since Ant 1.7.1</strong>.
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</p>
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<h3>Parameters</h3>
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<table border="1" cellpadding="2" cellspacing="0">
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<tr>
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<td valign="top"><b>Attribute</b></td>
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<td valign="top"><b>Description</b></td>
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<td align="center" valign="top"><b>Required</b></td>
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</tr>
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<tr>
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<td valign="top">file</td>
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<td valign="top">The name of the file.</td>
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<td valign="top" align="center">Unless a nested resource collection element
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has been specified.</td>
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</tr>
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<tr>
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<td valign="top">length</td>
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<td valign="top">Specifies the new file length (in bytes) to set.
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The following suffixes are supported:
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<ul>
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<li>K : Kilobytes (1024 bytes)</li>
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<li>M : Megabytes (1024 K)</li>
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<li>G : Gigabytes (1024 M)</li>
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<li>T : Terabytes (1024 G)</li>
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<li>P : Petabytes (1024 T)</li>
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</ul>
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</td>
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<td valign="center" align="center" rowspan="2">At most one of these.
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Omitting both implies <code>length="0"</code>.
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</td>
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</tr>
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<tr>
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<td valign="top">adjust</td>
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<td valign="top">Specifies the number of bytes
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(and positive/negative direction)
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by which to adjust file lengths. The same suffixes are supported
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for this attribute as for the <code>length</code> attribute.
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</td>
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2007-03-02 19:27:56 +00:00
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</tr>
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<tr>
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<td valign="top">create</td>
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<td valign="top">Whether to create nonexistent files.</td>
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<td valign="top" align="center">No, default <i>true</i>.</td>
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</tr>
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<tr>
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<td valign="top">mkdirs</td>
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<td valign="top">Whether to create nonexistent parent
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directories when creating new files.</td>
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<td valign="top" align="center">No, default <i>false</i>.</td>
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</tr>
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</table>
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<h3>Parameters specified as nested elements</h3>
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<h4>any resource collection</h4>
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<p>You can use any number of nested resource collection elements to
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define the resources for this task and refer to resources defined
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elsewhere. <b>Note:</b> resources passed to this task are expected
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to be filesystem-based.</p>
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<h3>Examples</h3>
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<pre> <truncate file="foo" /></pre>
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<p>Sets the length of file <code>foo</code> to zero.</p>
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<pre> <truncate file="foo" length="1K" /></pre>
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<p>Sets the length of file <code>foo</code> to 1 kilobyte (1024 bytes).</p>
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<pre> <truncate file="foo" adjust="1K" /></pre>
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<p>Adjusts the length of file <code>foo</code> upward by 1 kilobyte.</p>
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<pre> <truncate file="foo" adjust="-1M" /></pre>
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<p>Adjusts the length of file <code>foo</code> downward by 1 megabyte.</p>
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</body>
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</html>
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