Linux文件清空的五种方法总结分享

卡地亚的生活 發表於 2023-11-25 00:00:00

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本文主要介绍的是Linux文件清空的五种方法，下面话不多说，来看看详细的介绍吧。</p>
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<strong>1、使用重定向的方法</strong></p>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">4.0K </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<code class="bash plain"></code><code class="bash comments"># > test.txt </code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">0 </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<strong>2、使用true命令重定向清空文件</strong></p>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">4.0K </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<code class="bash plain"></code><code class="bash comments"># true > test.txt </code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">0 </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<strong>3、使用cat/cp/dd命令及/dev/null设备来清空文件</strong></p>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">4.0K </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<code class="bash plain"></code><code class="bash comments"># cat /dev/null > test.txt </code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash spaces"> </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<code class="bash comments">###################################################</code>
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<code class="bash plain"></code><code class="bash comments"># echo "Hello World" > test.txt </code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">4.0K </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<code class="bash plain"></code><code class="bash comments"># cp /dev/null test.txt </code>
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<code class="bash functions">cp</code><code class="bash plain">：是否覆盖</code><code class="bash string">"test.txt"</code><code class="bash plain">？ y</code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash spaces"> </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<code class="bash comments">##################################################</code>
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<code class="bash plain"></code><code class="bash comments"># echo "Hello World" > test.txt </code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">4.0K </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<code class="bash plain"></code><code class="bash comments"># dd if=/dev/null of=test.txt </code>
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<code class="bash plain">记录了0+0 的读入</code>
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<code class="bash plain">记录了0+0 的写出</code>
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<code class="bash plain">0字节(0 B)已复制，0.000266781 秒，0.0 kB/秒</code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash spaces"> </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<strong>4、使用echo命令清空文件</strong></p>
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<code class="bash plain"></code><code class="bash comments"># echo "Hello World" > test.txt </code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">4.0K </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<code class="bash plain"></code><code class="bash comments"># echo -n "" > test.txt ==>要加上"-n"参数，默认情况下会"\n"，也就是回车符</code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">0 </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<strong>5、使用truncate命令清空文件</strong></p>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">4.0K </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<code class="bash plain"></code><code class="bash comments"># truncate -s 0 test.txt -s参数用来设定文件的大小，清空文件，就设定为0；</code>
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<code class="bash plain"></code><code class="bash comments"># du -h test.txt </code>
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<code class="bash plain">0 </code><code class="bash functions">test</code><code class="bash plain">.txt</code>
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<strong>总结</strong></p>
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以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对的支持。</p>
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原文链接：http://www.cnblogs.com/mrwang1101/p/6166326.html</p>

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Linux文件清空的五种方法总结分享