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102 lines
3.4 KiB
HTML
102 lines
3.4 KiB
HTML
<!DOCTYPE html>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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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 not use this file except in compliance with
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the License. You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<html lang="en">
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<head>
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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 id="touch">Truncate</h2>
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<p><em>Since Apache Ant 1.7.1</em></p>
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<h3>Description</h3>
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<p>Set the length of one or more files, as the <code>truncate</code> Unix function or GNU
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utility. In addition to working with a single file, this Task can also work
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on <a href="../Types/resources.html">resources</a> and resource collections.</p>
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<h3>Parameters</h3>
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<table class="attr">
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<tr>
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<th scope="col">Attribute</th>
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<th scope="col">Description</th>
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<th scope="col">Required</th>
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</tr>
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<tr>
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<td>file</td>
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<td>The name of the file.</td>
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<td>Unless a nested resource collection element has been specified</td>
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</tr>
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<tr>
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<td>length</td>
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<td>Specifies the new file length (in bytes) to set. The following suffixes are supported:
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<ul>
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<li><q>K</q> : Kilobytes (1024 bytes)</li>
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<li><q>M</q> : Megabytes (1024 K)</li>
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<li><q>G</q> : Gigabytes (1024 M)</li>
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<li><q>T</q> : Terabytes (1024 G)</li>
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<li><q>P</q> : Petabytes (1024 T)</li>
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</ul>
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</td>
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<td rowspan="2">At most one of these; omitting both implies <var>length</var>=<q>0</q>
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</td>
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</tr>
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<tr>
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<td>adjust</td>
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<td class="left">Specifies the number of bytes (and positive/negative direction) by which to
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adjust file lengths. The same suffixes are supported for this attribute as for
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the <var>length</var> attribute.
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</td>
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</tr>
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<tr>
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<td>create</td>
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<td>Whether to create nonexistent files.</td>
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<td>No; default <q>true</q></td>
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</tr>
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<tr>
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<td>mkdirs</td>
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<td>Whether to create nonexistent parent directories when creating new files.</td>
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<td>No; default <q>false</q></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 define the resources for this
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task and refer to resources defined elsewhere. <strong>Note</strong>: resources passed to this task
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are expected to be filesystem-based.</p>
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<h3>Examples</h3>
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<p>Set the length of file <samp>foo</samp> to zero.</p>
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<pre><truncate file="foo"/></pre>
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<p>Set the length of file <samp>foo</samp> to 1 kilobyte (1024 bytes).</p>
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<pre><truncate file="foo" length="1K"/></pre>
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<p>Adjust the length of file <samp>foo</samp> upward by 1 kilobyte.</p>
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<pre><truncate file="foo" adjust="1K"/></pre>
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<p>Adjust the length of file <samp>foo</samp> downward by 1 megabyte.</p>
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<pre><truncate file="foo" adjust="-1M"/></pre>
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</body>
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</html>
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