Linux 在Shell脚本中使用函数实例详解
<p><strong>Linux 在Shell脚本中使用函数实例详解</strong></p>
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<strong>Shell的函数</strong></p>
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Shell程序也支持函数。函数能完成一特定的功能，可以重复调用这个函数。</p>
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函数格式如下：</p>
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<code class="bash plain">函数名()</code>
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<code class="bash plain">{</code>
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<code class="bash spaces"> </code><code class="bash plain">函数体</code>
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<code class="bash plain">}</code>
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函数调用方式：</p>
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函数名 参数列表 </p>
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实例：编写一函数add求两个数的和，这两个数用位置参数传入，最后输出结果。</p>
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<code class="bash plain">root@ubuntu:</code><code class="bash plain">/home/study</code><code class="bash comments"># vi test3 </code>
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<code class="bash preprocessor bold">#!/bin/bash</code>
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<code class="bash spaces"> </code>
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<code class="bash plain">add(){</code>
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<code class="bash spaces"> </code><code class="bash plain">a=$1;</code>
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<code class="bash spaces"> </code><code class="bash plain">b=$2;</code>
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<code class="bash spaces"> </code><code class="bash plain">z=`</code><code class="bash functions">expr</code> <code class="bash plain">$a + $b`;</code>
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<code class="bash spaces"> </code><code class="bash functions">echo</code> <code class="bash string">"The sum is $z"</code><code class="bash plain">;</code>
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<code class="bash plain">}</code>
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<code class="bash plain">add $1 $2</code>
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<code class="bash plain">root@ubuntu:</code><code class="bash plain">/home/study</code><code class="bash comments"># chmod +x test3</code>
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<code class="bash plain">root@ubuntu:</code><code class="bash plain">/home/study</code><code class="bash comments"># ./test3 1 2</code>
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感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！</p>
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原文链接：http://www.cnblogs.com/linjiqin/p/3148715.html</p>
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