how to use xmllint in order to get value from xml

Question

I have the following XML file

<?xml version="1.0" encoding="UTF-8" ?>
<!-- Component configuration file -->
<Component>
   <Name>install_env</Name>
   <HelpString>install_env Com</HelpString>
   <Version>1.10.3</Version>
                <Properties>

how to get the value of Name tag - install_env

by using the tool - xmllint

Solution

With your testfile:

<?xml version="1.0" encoding="UTF-8" ?>
<!-- Component configuration file -->
<Component>
   <Name>install_env</Name>
   <HelpString>install_env Com</HelpString>
   <Version>1.10.3</Version>
</Component>

I use --xpath argument to get the value of the name tag:

user$ test=$(xmllint --xpath "//Component/Name/text()" testfile) 
user$ echo $test
install_env

--xpath implies --noout, which prevents xmllint from outputting anything. Redirect the output to a variable or a file.