How to parse xml tags in bash or retrieve xml tag values in linux

Consider the following example file test.xml

<header>

        <tag1>1</tag1>

        <system>test123</system>

        <cdc>230</cdc>

       

</header>

   
 


 grep -E -m 1 -o "(.*)" test.xml

This will return "test123"


if you want only the value we need to pipe it further

grep -E -m 1 -o "(.*)" test.xml | sed -e 's,.*\([^<]*\).*,\1,g'

This will return "test123"