在shell脚本同一级别的其他标签的提取标签 [英] extracting an tag at the same level of another tag in shell script

问题描述

说我有以下XML：

<app-deployment>
    <name>gr1</name>
    <target>AdminServer</target>
    <module-type>ear</module-type>
    <source-path>/u01/app/wls1035_homes/wls1035_9999/grc864</source-path>
    <security-dd-model>DDOnly</security-dd-model>
    <staging-mode>stage</staging-mode>
</app-deployment>
<app-deployment>
    <name>gr2</name>
    <target>AdminServer</target>
    <module-type>ear</module-type>
    <source-path>/u01/app/wls1035_homes/wls1035_9999/grc864</source-path>
    <security-dd-model>DDOnly</security-dd-model>
    <staging-mode>nostage</staging-mode>
</app-deployment>  
<app-deployment>
    <name>gr3</name>
    <target>AdminServer</target>
    <module-type>ear</module-type>
    <source-path>/u01/app/wls1035_homes/wls1035_9999/grc864</source-path>
    <security-dd-model>DDOnly</security-dd-model>
</app-deployment>

我怎么能提取分期模式变量的值，说了名为GR2应用程序的部署？

how can i extract the value of the staging-mode tag, say for the app-deployment named gr2?

推荐答案

很多人（包括我自己），会告诉你，这是一个傻瓜的差事解析XML具有reg-EX基础的工具，那你应该使用专门的工具XML解析。 Xpath的应该适用于这一点，xmlstarlet就可以快速安装和使用包。

Many people (including myself), will tell you that it is a fools errand to parse xml with reg-ex based tools, and that you should use tools designed for xml parsing. Xpath should work for this, and xmlstarlet would be a package you could install and use quickly.

这是说，因为你承担你的数据会一直得到很好的形成，这是pretty容易使awk脚本搜索1模式，设置一个标志，寻找另一种模式，设置一个标志，等。而当你已经找到了最终目标，清理线路只提取所需的数据。

That said, given that you assume your data will always be well formed, it is pretty easy to make an awk script to search for 1 pattern, set a flag, look for another pattern, set a flag, etc. And when you have found the final target, cleanup the line to extract just the data you want.

set -- gr2
{ cat - <<-EOS
<app-deployment>
    <name>gr2</name>
    <target>AdminServer</target>
    <module-type>ear</module-type>
    <source-path>/u01/app/wls1035_homes/wls1035_9999/grc864</source-path>
    <security-dd-model>DDOnly</security-dd-model>
    <staging-mode>nostage</staging-mode>
</app-deployment>
EOS
} | awk '
    /[<]app-deployment/{a=1}
    a && /[<]name[>]'"$1"'/{n=1}
    a && n && /[<]staging-mode[>]/{
      sub(/[<]staging-mode[>]/,"", $0)
      sub(/[<]\/staging-mode[>]/,"",$0)
      print $0
      exit
    }
    #dbg { print "a=" a "\tn=" n }
  '

输出

       nostage

的设置 - GR3 和 {...猫} | 是一个测试工具，你会包装这是一个shell脚本，即

The set -- gr3 and { cat ... } | are a testing harness, you would wrap this is a shell script i.e.

 cat printXMLarg.bash
 #!/bin/bash
   targ=$1; shift
   awk '
    /[<]app-deployment/{a=1}
    a && /[<]name[>]'"${targ}"'/{n=1}
    a && n && /[<]staging-mode[>]/{
      sub(/[<]staging-mode[>]/,"", $0)
      sub(/[<]\/staging-mode[>]/,"",$0)
      print $0
      exit
    }
    #dbg { print "a=" a "\tn=" n }
  ' "${@}"

和调用像

  printXMLarg.bash gr3 *.xml

这第二部分是未经测试。让我知道，如果你有它的问题。

This 2nd part is untested. Let me know if you have problems with it.

我希望这有助于

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