shell脚本从正斜杠分隔的变量中提取文本 [英] shell script to extract text from a variable separated by forward slashes

问题描述

我正在尝试找到一种方法来从变量中提取文本，并用正斜杠分隔单词.我尝试使用cut进行尝试，所以这是一个示例:

I am trying to find a way to to extract text from a variable with words separated by a forward slash. I attempted it using cut, so here's an example:

set variable = '/one/two/three/four'  

说，我只想从中提取three，

cut -d/ -f3 <<<"${variable}"

但这似乎行不通.关于我在做什么错的任何想法吗?还是有一种使用AWK做到这一点的方法?

But this seems to not work. Any ideas of what I'm doing wrong? Or is there a way of using AWK to do this?

推荐答案

在分配字符串或变量期间，您需要删除=之前和之后的空格.并告诉cut命令打印第四个字段.

You need to remove the spaces before and after to = during string or variable assignment. And tell the cut command to print the 4th field.

$ variable='/one/two/three/four'
$ cut -d/ -f4 <<<"${variable}"
three

使用定界符/，cut命令将输入​​分割为类似的内容.

With the delimiter /, cut command splits the input like.

             /one/two/three/four
            |  |   |    |    |
            1  2   3    4    5

也就是说，当它在第一个斜杠处分割时，您将获得一个空字符串作为第一列.

that is, when it splits on first slash , you get an empty string as first column.

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