壳解析线寻找一个特定的标记 [英] shell parsing a line to look for a certain tag

问题描述

我打算创建一个简单的脚本编辑基于存储属性文件中值的文件。
所以基本上，我通过在原文件中的每一行计划循环，当遇到特定标记行内说的/＃，它将获取文本以下标签即证书，然后实现一个功能通过属性来解析文件以获取一定的值，并将其添加到原始文件。
因此，例如，该文件将有以下行：

I am planning to create a simple script to edit a file based on values stored within a properties file. So essentially I am planning to loop through each line in the original file, when it comes across a certain tag within a line say "/#" it will get the text following the tag i.e. certs and then implement a function to parse through the properties file to get certain values and add them to the original file. So for example the file would have the following line:

/＃证书

我不知道如何最好地搜索标签，我正打算有一个，如果找到/＃，然后平分剩余的文本得到的字符串。

I am not sure how best to search for the tag, I was planning to have an if to find the /# and then split the remaining text to get the string.

while read line
    do

    #need to parse line to look for tag


    echo line >> ${NEW_FILE}
    done < ${OLD_FILE}

任何帮助会Ëpciated大大AP $ P $

Any help would e greatly appreciated

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编辑：

我的解释是有点差;道歉。我只是想获得/＃以下文字 - 即我只是想获得的字符串值precedes它。然后我可以调用基于文本就是一个函数。

My explanation was a bit poor; apologies. I am merely trying to get the text following the /# - i.e. I just want to get the string value that precedes it. I can then call a function based on what the text is.

推荐答案

这是移植到Bourne shell的，因此，当然，KSH和Bash。

This is portable to Bourne shell and thus, of course, ksh and Bash.

case $line in
    '/#'* ) tag="${line#/\#}" ;;
esac

要放入一些上下文，这里是如何使用它一个更现实的例子：

To put it into some sort of context, here is a more realistic example of how you might use it:

while read line; do
    case $line in
        '/#'* ) tag="${line#/\#}" ;;
        *) continue ;; # skip remainder of loop for lines without a tag
    esac
    echo "$tag"
    # Or maybe do something more complex, such as
    case $tag in
        cert)
           echo 'We have a cert!' >&2 ;;
        bingo)
           echo 'You are the winner.' >&2
           break # terminate loop
           ;;
        esac
done <$OLD_FILE >$NEW_FILE

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