UNIX脚本提取值在XML文件中

Question

我有一个XML文件，如下：

<xml>Workinstance name="suvi" permission="read" id="6543"</xml> 
<xml>Projectinstance name="ram" permission="write" id="3534"</xml> 

我想从XML文件显示workinstance id字段。

Answer 1

grep '<xml>Workinstance' file.xml | grep -o 'id="[^"]*' | cut -c5- 

Answer 2

$ awk '/Workinstance/{ gsub(/.*id=\042|\042.*/,""); print } ' file 
6543