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165 lines
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<h1 class="title" id="leanote-title">shell切分字符串</h1>
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<div class="content-html" id="leanote-content"><p>假设有变量 var=http://www.aaa.com/123.htm.</p><p><strong>1. # 号截取，删除左边字符，保留右边字符。</strong></p><pre id="leanote_ace_1510641012228_0" class="brush:sh ace-tomorrow" data-mce-style="line-height: 1.5; font-size: 14px; height: 21px;">echo ${var#*//}</pre><div class="cnblogs_Highlighter sh-gutter"></div><p> 其中 var 是变量名，# 号是运算符，*// 表示从左边开始删除第一个 // 号及左边的所有字符<br>即删除 http://<br>结果是 ：www.aaa.com/123.htm</p><p><strong>2. ## 号截取，删除左边字符，保留右边字符。</strong></p><pre id="leanote_ace_1510641029237_0" class="brush:sh ace-tomorrow" data-mce-style="line-height: 1.5; font-size: 14px; height: 21px;">echo ${var##*/}</pre><p>##*/ 表示从左边开始删除最后（最右边）一个 / 号及左边的所有字符<br>即删除 http://www.aaa.com/</p><p>结果是 123.htm</p><p><strong>3. %号截取，删除右边字符，保留左边字符</strong></p><pre id="leanote_ace_1510641048759_0" class="brush:sh ace-tomorrow" data-mce-style="line-height: 1.5; font-size: 14px; height: 21px;">echo ${var%/*}</pre><p>%/* 表示从右边开始，删除第一个 / 号及右边的字符</p><p>结果是：http://www.aaa.com</p><p><strong>4. %% 号截取，删除右边字符，保留左边字符</strong></p><pre id="leanote_ace_1510641063144_0" class="brush:sh ace-tomorrow" data-mce-style="line-height: 1.5; font-size: 14px; height: 21px;">echo ${var%%/*}</pre><div class="cnblogs_Highlighter sh-gutter"></div><p> %%/* 表示从右边开始，删除最后（最左边）一个 / 号及右边的字符<br>结果是：http:<br>5. 从左边第几个字符开始，及字符的个数</p><pre id="leanote_ace_1510641082309_0" class="brush:sh ace-tomorrow">echo ${var:0:5}</pre><p>其中的 0 表示左边第一个字符开始，5 表示字符的总个数。<br>结果是：http:</p><p><strong>6. 从左边第几个字符开始，一直到结束。</strong></p><pre id="leanote_ace_1510641095161_0" class="brush:sh ace-tomorrow">echo ${var:7}</pre><p>其中的 7 表示左边第8个字符开始，一直到结束。<br>结果是 ：www.aaa.com/123.htm</p><p><strong>7. 从右边第几个字符开始，及字符的个数</strong></p><pre id="leanote_ace_1510641110972_0" class="brush:sh ace-tomorrow">echo ${var:0-7:3}</pre><p>其中的 0-7 表示右边算起第七个字符开始，3 表示字符的个数。<br>结果是：123</p><p><strong>8. 从右边第几个字符开始，一直到结束。</strong></p><pre id="leanote_ace_1510641115755_0" class="brush:sh ace-tomorrow">echo ${var:0-7}</pre><p>表示从右边第七个字符开始，一直到结束。<br>结果是：123.htm</p><p>注：（左边的第一个字符是用 0 表示，右边的第一个字符用 0-1 表示）</p></div>
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